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pygo/gnugo/engine/dragon.c

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Beginning of implementation of a ctypes-based interface to libboard, which is a much cleaner set of Go routines than I hacked together originally. Including a copy of gnugo 3.8 so we can build a dynamic version of libboard.
2012-04-12 17:46:27 +00:00
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
* This is GNU Go, a Go program. Contact gnugo@gnu.org, or see *
* http://www.gnu.org/software/gnugo/ for more information. *
* *
* Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, *
* 2008 and 2009 by the Free Software Foundation. *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation - version 3 or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License in file COPYING for more details. *
* *
* You should have received a copy of the GNU General Public *
* License along with this program; if not, write to the Free *
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, *
* Boston, MA 02111, USA. *
\* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* A "dragon" is a union of strings of the same color which will be
* treated as a unit. The dragons are generated anew at each
* move. If two strings are in the dragon, it is GNU Go's working
* hypothesis that they will live or die together and are
* effectively connected.
*
* _____/| (! !)
* / ____/| /@ @)
* / / __ // +--oo
* | / | >> /< _-v--}
* | | UUU\\\ / / \\
* | | __ _\\\ \ \ U
* | | / V \\--> \ \
* | <_/ \_/ }
* | __ ____ /
* \ / \___/ / /\
* < \< < <\ \
* ( ))) ( )))))
*/
#include "gnugo.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "liberty.h"
#include "gg_utils.h"
static void initialize_supplementary_dragon_data(void);
static void find_lunches(void);
static void eye_computations(void);
static void revise_inessentiality(void);
static void find_neighbor_dragons(void);
static void add_adjacent_dragons(int a, int b);
static void add_adjacent_dragon(int a, int b);
static int dragon_invincible(int pos);
static int dragon_looks_inessential(int origin);
static void identify_thrashing_dragons(void);
static void analyze_false_eye_territory(void);
static int connected_to_eye(int pos, int str, int color, int eye_color,
struct eye_data *eye);
static void connected_to_eye_recurse(int pos, int str, int color,
int eye_color, struct eye_data *eye,
signed char *mx, signed char *me,
int *halfeyes);
static enum dragon_status compute_crude_status(int pos);
static int compute_escape(int pos, int dragon_status_known);
static void compute_surrounding_moyo_sizes(const struct influence_data *q);
static void clear_cut_list(void);
static int dragon2_initialized;
static int lively_white_dragons;
static int lively_black_dragons;
/* This is a private array to obtain a list of worms belonging to each
* dragon. Public access is via first_worm_in_dragon() and
* next_worm_in_dragon().
*/
static int next_worm_list[BOARDMAX];
/* Alternative for DRAGON2 macro with asserts. */
struct dragon_data2 *
dragon2_func(int pos)
{
ASSERT1(ON_BOARD1(pos)
&& dragon[pos].id >= 0
&& dragon[pos].id < number_of_dragons, pos);
return &dragon2[dragon[pos].id];
}
/* This basic function finds all dragons and collects some basic information
* about them in the dragon array.
*
* color is the player in turn to move. This does in no way affect the
* information collected about the dragons, but it does affect what
* information is passed on to the move generation code. If
* color == EMPTY no information at all is passed on to the move generation.
*/
void
make_dragons(int stop_before_owl)
{
int str;
int d;
dragon2_initialized = 0;
initialize_dragon_data();
/* Find explicit connections patterns in database and amalgamate
* involved dragons.
*/
memset(cutting_points, 0, sizeof(cutting_points));
find_cuts();
find_connections();
/* At this time, all dragons have been finalized and we can
* initialize the dragon2[] array. After that we can no longer allow
* amalgamation of dragons.
*/
initialize_supplementary_dragon_data();
make_domains(black_eye, white_eye, 0);
/* Find adjacent worms which can be easily captured: */
find_lunches();
/* Find topological half eyes and false eyes. */
find_half_and_false_eyes(BLACK, black_eye, half_eye, NULL);
find_half_and_false_eyes(WHITE, white_eye, half_eye, NULL);
/* Compute the number of eyes, half eyes, determine attack/defense points
* etc. for all eye spaces. */
eye_computations();
/* Try to determine whether topologically false and half eye points
* contribute to territory even if the eye doesn't solidify.
*/
analyze_false_eye_territory();
/* Now we compute the genus. */
for (d = 0; d < number_of_dragons; d++)
compute_dragon_genus(dragon2[d].origin, &dragon2[d].genus, NO_MOVE);
/* Compute the escape route measure. */
for (str = BOARDMIN; str < BOARDMAX; str++)
if (IS_STONE(board[str]) && dragon[str].origin == str)
DRAGON2(str).escape_route = compute_escape(str, 0);
/* Set dragon weaknesses according to initial_influence. */
compute_refined_dragon_weaknesses();
for (d = 0; d < number_of_dragons; d++)
dragon2[d].weakness_pre_owl = dragon2[d].weakness;
/* Determine status: ALIVE, DEAD, CRITICAL or UNKNOWN */
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str))
if (dragon[str].origin == str && board[str])
dragon[str].crude_status = compute_crude_status(str);
/* We must update the dragon status at every intersection before we
* call the owl code. This updates all fields.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str) && board[str] != EMPTY)
dragon[str] = dragon[dragon[str].origin];
find_neighbor_dragons();
for (d = 0; d < number_of_dragons; d++) {
dragon2[d].surround_status
= compute_surroundings(dragon2[d].origin, NO_MOVE, 0,
&(dragon2[d].surround_size));
if (dragon2[d].surround_status == SURROUNDED) {
dragon2[d].escape_route = 0;
if (debug & DEBUG_DRAGONS)
gprintf("surrounded dragon found at %1m\n", dragon2[d].origin);
}
else if (dragon2[d].surround_status == WEAKLY_SURROUNDED) {
dragon2[d].escape_route /= 2;
if (debug & DEBUG_DRAGONS)
gprintf("weakly surrounded dragon found at %1m\n", dragon2[d].origin);
}
}
if (stop_before_owl)
return;
/* Determine life and death status of each dragon using the owl code
* if necessary.
*/
start_timer(2);
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)) {
int attack_point = NO_MOVE;
int defense_point = NO_MOVE;
struct eyevalue no_eyes;
set_eyevalue(&no_eyes, 0, 0, 0, 0);
if (board[str] == EMPTY
|| dragon[str].origin != str)
continue;
/* Some dragons can be ignored but be extra careful with big dragons. */
if (crude_dragon_weakness(ALIVE, &no_eyes, 0,
DRAGON2(str).moyo_territorial_value,
DRAGON2(str).escape_route - 10)
< 0.00001 + gg_max(0.12, 0.32 - 0.01*dragon[str].effective_size)) {
DRAGON2(str).owl_status = UNCHECKED;
DRAGON2(str).owl_attack_point = NO_MOVE;
DRAGON2(str).owl_defense_point = NO_MOVE;
}
else {
int acode = 0;
int dcode = 0;
int kworm = NO_MOVE;
int owl_nodes_before = get_owl_node_counter();
start_timer(3);
acode = owl_attack(str, &attack_point,
&DRAGON2(str).owl_attack_certain, &kworm);
DRAGON2(str).owl_attack_node_count
= get_owl_node_counter() - owl_nodes_before;
if (acode != 0) {
DRAGON2(str).owl_attack_point = attack_point;
DRAGON2(str).owl_attack_code = acode;
DRAGON2(str).owl_attack_kworm = kworm;
if (attack_point != NO_MOVE) {
kworm = NO_MOVE;
dcode = owl_defend(str, &defense_point,
&DRAGON2(str).owl_defense_certain, &kworm);
if (dcode != 0) {
if (defense_point != NO_MOVE) {
DRAGON2(str).owl_status = (acode == GAIN ? ALIVE : CRITICAL);
DRAGON2(str).owl_defense_point = defense_point;
DRAGON2(str).owl_defense_code = dcode;
DRAGON2(str).owl_defense_kworm = kworm;
}
else {
/* Due to irregularities in the owl code, it may
* occasionally happen that a dragon is found to be
* attackable but also alive as it stands. In this case
* we still choose to say that the owl_status is
* CRITICAL, although we don't have any defense move to
* propose. Having the status right is important e.g.
* for connection moves to be properly valued.
*/
DRAGON2(str).owl_status = (acode == GAIN ? ALIVE : CRITICAL);
DEBUG(DEBUG_OWL_PERFORMANCE,
"Inconsistent owl attack and defense results for %1m.\n",
str);
/* Let's see whether the attacking move might be the right
* defense:
*/
dcode = owl_does_defend(DRAGON2(str).owl_attack_point,
str, NULL);
if (dcode != 0) {
DRAGON2(str).owl_defense_point
= DRAGON2(str).owl_attack_point;
DRAGON2(str).owl_defense_code = dcode;
}
}
}
}
if (dcode == 0) {
DRAGON2(str).owl_status = DEAD;
DRAGON2(str).owl_defense_point = NO_MOVE;
DRAGON2(str).owl_defense_code = 0;
}
}
else {
if (!DRAGON2(str).owl_attack_certain) {
kworm = NO_MOVE;
dcode = owl_defend(str, &defense_point,
&DRAGON2(str).owl_defense_certain, &kworm);
if (dcode != 0) {
/* If the result of owl_attack was not certain, we may
* still want the result of owl_defend */
DRAGON2(str).owl_defense_point = defense_point;
DRAGON2(str).owl_defense_code = dcode;
DRAGON2(str).owl_defense_kworm = kworm;
}
}
DRAGON2(str).owl_status = ALIVE;
DRAGON2(str).owl_attack_point = NO_MOVE;
DRAGON2(str).owl_attack_code = 0;
}
}
}
time_report(2, " owl reading", NO_MOVE, 1.0);
/* Compute the status to be used by the matcher. We most trust the
* owl status, if it is available. If it's not we assume that we are
* already confident that the dragon is alive, regardless of
* crude_status.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (IS_STONE(board[str])) {
if (DRAGON2(str).owl_status != UNCHECKED)
dragon[str].status = DRAGON2(str).owl_status;
else
dragon[str].status = ALIVE;
}
/* The dragon data is now correct at the origin of each dragon but
* we need to copy it to every vertex.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str) && board[str] != EMPTY)
dragon[str] = dragon[dragon[str].origin];
identify_thrashing_dragons();
/* Owl threats. */
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)
&& board[str] != EMPTY
&& dragon[str].origin == str) {
struct eyevalue no_eyes;
set_eyevalue(&no_eyes, 0, 0, 0, 0);
if (crude_dragon_weakness(ALIVE, &no_eyes, 0,
DRAGON2(str).moyo_territorial_value,
DRAGON2(str).escape_route - 10)
< 0.00001 + gg_max(0.12, 0.32 - 0.01*dragon[str].effective_size)) {
DRAGON2(str).owl_threat_status = UNCHECKED;
DRAGON2(str).owl_second_attack_point = NO_MOVE;
DRAGON2(str).owl_second_defense_point = NO_MOVE;
}
else {
int acode = DRAGON2(str).owl_attack_code;
int dcode = DRAGON2(str).owl_defense_code;
int defense_point, second_defense_point;
if (get_level() >= 8
&& !disable_threat_computation
&& (owl_threats
|| thrashing_stone[str])) {
if (acode && !dcode && DRAGON2(str).owl_attack_point != NO_MOVE) {
if (owl_threaten_defense(str, &defense_point,
&second_defense_point)) {
DRAGON2(str).owl_threat_status = CAN_THREATEN_DEFENSE;
DRAGON2(str).owl_defense_point = defense_point;
DRAGON2(str).owl_second_defense_point = second_defense_point;
}
else
DRAGON2(str).owl_threat_status = DEAD;
}
else if (!acode) {
int attack_point, second_attack_point;
if (owl_threaten_attack(str,
&attack_point, &second_attack_point)) {
DRAGON2(str).owl_threat_status = CAN_THREATEN_ATTACK;
DRAGON2(str).owl_attack_point = attack_point;
DRAGON2(str).owl_second_attack_point = second_attack_point;
}
else
DRAGON2(str).owl_threat_status = ALIVE;
}
}
}
}
/* Once again, the dragon data is now correct at the origin of each dragon
* but we need to copy it to every vertex.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str) && board[str] != EMPTY)
dragon[str] = dragon[dragon[str].origin];
time_report(2, " owl threats ", NO_MOVE, 1.0);
/* Compute the safety value. */
for (d = 0; d < number_of_dragons; d++) {
int true_genus;
int origin = dragon2[d].origin;
struct eyevalue *genus = &dragon2[d].genus;
/* FIXME: We lose information when constructing true_genus. This
* code can be improved.
*/
true_genus = max_eyes(genus) + min_eyes(genus);
if (dragon_looks_inessential(origin))
dragon2[d].safety = INESSENTIAL;
else if (dragon[origin].size == worm[origin].size
&& worm[origin].attack_codes[0] != 0
&& worm[origin].defense_codes[0] == 0)
dragon2[d].safety = TACTICALLY_DEAD;
else if (0) /* Seki is detected by the call to semeai() below. */
dragon2[d].safety = ALIVE_IN_SEKI;
else if (dragon_invincible(origin)) {
dragon2[d].safety = INVINCIBLE;
/* Sometimes the owl analysis may have misevaluated invincible
* dragons, typically if they live by topologically false eyes.
* Therefore we also set the status here.
*/
DRAGON(d).status = ALIVE;
}
else if (dragon2[d].owl_status == DEAD)
dragon2[d].safety = DEAD;
else if (dragon2[d].owl_status == CRITICAL)
dragon2[d].safety = CRITICAL;
else if (true_genus >= 6 || dragon2[d].moyo_size > 20)
dragon2[d].safety = STRONGLY_ALIVE;
else
dragon2[d].safety = ALIVE;
}
/* The status is now correct at the origin of each dragon
* but we need to copy it to every vertex.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str))
dragon[str].status = dragon[dragon[str].origin].status;
/* Revise inessentiality of critical worms and dragons. */
revise_inessentiality();
semeai();
time_report(2, " semeai module", NO_MOVE, 1.0);
/* Count the non-dead dragons. */
lively_white_dragons = 0;
lively_black_dragons = 0;
for (d = 0; d < number_of_dragons; d++)
if (DRAGON(d).status != DEAD) {
if (DRAGON(d).color == WHITE)
lively_white_dragons++;
else
lively_black_dragons++;
}
}
/* Find capturable worms adjacent to each dragon. */
static void
find_lunches()
{
int str;
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)) {
int food;
if (worm[str].origin != str
|| board[str] == EMPTY
|| worm[str].lunch == NO_MOVE)
continue;
food = worm[str].lunch;
/* In contrast to worm lunches, a dragon lunch must also be
* able to defend itself.
*/
if (worm[food].defense_codes[0] == 0)
continue;
/* Tell the move generation code about the lunch. */
add_lunch(str, food);
/* If several lunches are found, we pick the juiciest.
* First maximize cutstone, then minimize liberties.
*/
{
int origin = dragon[str].origin;
int lunch = DRAGON2(origin).lunch;
if (lunch == NO_MOVE
|| worm[food].cutstone > worm[lunch].cutstone
|| (worm[food].cutstone == worm[lunch].cutstone
&& (worm[food].liberties < worm[lunch].liberties))) {
DRAGON2(origin).lunch = worm[food].origin;
TRACE("at %1m setting %1m.lunch to %1m (cutstone=%d)\n",
str, origin,
worm[food].origin, worm[food].cutstone);
}
}
}
}
/* Compute the value of each eye space. Store its attack and defense point.
* A more comlete list of attack and defense points is stored in the lists
* black_vital_points and white_vital_points.
*/
static void
eye_computations()
{
int str;
for (str = BOARDMIN; str < BOARDMAX; str++) {
if (!ON_BOARD(str))
continue;
if (black_eye[str].color == BLACK
&& black_eye[str].origin == str) {
struct eyevalue value;
int attack_point, defense_point;
compute_eyes(str, &value, &attack_point, &defense_point,
black_eye, half_eye, 1);
DEBUG(DEBUG_EYES, "Black eyespace at %1m: %s\n", str,
eyevalue_to_string(&value));
black_eye[str].value = value;
propagate_eye(str, black_eye);
}
if (white_eye[str].color == WHITE
&& white_eye[str].origin == str) {
struct eyevalue value;
int attack_point, defense_point;
compute_eyes(str, &value, &attack_point, &defense_point,
white_eye, half_eye, 1);
DEBUG(DEBUG_EYES, "White eyespace at %1m: %s\n", str,
eyevalue_to_string(&value));
white_eye[str].value = value;
propagate_eye(str, white_eye);
}
}
}
/* This function revises the inessentiality of critical worms and dragons
* according to the criteria explained in the comments below.
*/
static void
revise_inessentiality()
{
int str;
/* Revise essentiality of critical worms. Specifically, a critical
* worm which is adjacent to no enemy dragon with status
* better than DEAD, is considered INESSENTIAL.
*
* A typical case of this is
*
* |.XXXX
* |.OO.X
* |X.O.X
* |.OO.X
* +-----
*
* However, to be able to deal with the position
*
* |.XXXX
* |.OOOO
* |..O.O
* |X.OOO
* |..O.O
* +-----
*
* we need to extend "adjacent" to "adjacent or shares a liberty",
* which is why we use extended_chainlinks() rather than
* chainlinks().
*
* Finally, if the position above is slightly modified to
*
* |.XXXXX
* |.OOOOO
* |...O.O
* |X..OOO
* |...O.O
* +------
*
* we have a position where the critical X stone doesn't share a
* liberty with any string at all. Thus the revised rule is:
*
* A critical worm which is adjacent to or share a liberty with at
* least one dead opponent dragon and no opponent dragon which is
* not dead, is considered inessential.
*/
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)) {
if (is_worm_origin(str, str)
&& worm[str].attack_codes[0] != 0
&& worm[str].defense_codes[0] != 0
&& !worm[str].inessential) {
int adjs[MAXCHAIN];
int neighbors;
int r;
int essential = 0;
neighbors = extended_chainlinks(str, adjs, 0);
for (r = 0; r < neighbors; r++)
if (dragon[adjs[r]].status != DEAD) {
essential = 1;
break;
}
if (!essential && neighbors > 0) {
DEBUG(DEBUG_WORMS, "Worm %1m revised to be inessential.\n", str);
worm[str].inessential = 1;
propagate_worm(str);
}
}
}
/* Revise essentiality of critical dragons. Specifically, a critical
* dragon consisting entirely of inessential worms is considered
* INESSENTIAL.
*/
for (str = BOARDMIN; str < BOARDMAX; str++) {
if (ON_BOARD(str)
&& board[str] != EMPTY
&& dragon[str].origin == str
&& DRAGON2(str).safety == CRITICAL) {
int w;
for (w = first_worm_in_dragon(str); w != NO_MOVE;
w = next_worm_in_dragon(w)) {
if (!worm[w].inessential)
break;
}
if (w == NO_MOVE) {
DEBUG(DEBUG_DRAGONS, "Dragon %1m revised to be inessential.\n", str);
DRAGON2(str).safety = INESSENTIAL;
}
}
}
}
/* Initialize the dragon[] array. */
void
initialize_dragon_data(void)
{
int str;
/* VALGRIND_MAKE_WRITABLE(dragon, BOARDMAX * sizeof(struct dragon_data)); */
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)) {
dragon[str].id = -1;
dragon[str].size = worm[str].size;
dragon[str].effective_size = worm[str].effective_size;
dragon[str].color = worm[str].color;
dragon[str].origin = worm[str].origin;
dragon[str].crude_status = UNKNOWN;
dragon[str].status = UNKNOWN;
half_eye[str].type = 0;
half_eye[str].value = 10.0; /* Something big. */
if (IS_STONE(board[str]) && worm[str].origin == str)
DEBUG(DEBUG_DRAGONS,
"Initializing dragon from worm at %1m, size %d\n",
str, worm[str].size);
}
memset(next_worm_list, 0, sizeof(next_worm_list));
/* We need to reset this to avoid trouble on an empty board when
* moves have previously been generated for a non-empty board.
*
* Comment: The cause of this is that make_dragons() is not called
* for an empty board, only initialize_dragon_data(), so we never
* reach initialize_supplementary_dragon_data().
*/
number_of_dragons = 0;
clear_cut_list();
memset(black_vital_points, 0, BOARDMAX * sizeof(struct vital_eye_points));
memset(white_vital_points, 0, BOARDMAX * sizeof(struct vital_eye_points));
}
/* Initialize the dragon2[] array. */
static void
initialize_supplementary_dragon_data(void)
{
int str;
int d;
int origin;
/* Give each dragon (caves excluded) an id number for indexing into
* the dragon2 array. After this the DRAGON2 macro can be used.
*/
number_of_dragons = 0;
for (str = BOARDMIN; str < BOARDMAX; str++) {
if (!ON_BOARD(str))
continue;
origin = dragon[str].origin;
if (board[str] == EMPTY)
continue;
if (dragon[origin].id == -1)
dragon[origin].id = number_of_dragons++;
dragon[str].id = dragon[origin].id;
}
/* Now number_of_dragons contains the number of dragons and we can
* allocate a dragon2 array of the appropriate size. First throw
* away the old array.
*
* FIXME: As a future optimization we should only allocate a new
* array if the old one is too small.
*/
if (dragon2 != NULL)
free(dragon2);
dragon2 = malloc(number_of_dragons * sizeof(*dragon2));
gg_assert(dragon2 != NULL);
/* Find the origins of the dragons to establish the mapping back to
* the board. After this the DRAGON macro can be used.
*/
for (str = BOARDMIN; str < BOARDMAX; str++) {
if (!ON_BOARD(str))
continue;
if (IS_STONE(board[str])
&& dragon[str].origin == str) {
DRAGON2(str).origin = str;
}
}
/* Initialize the rest of the dragon2 data. */
for (d = 0; d < number_of_dragons; d++) {
dragon2[d].neighbors = 0;
dragon2[d].hostile_neighbors = 0;
dragon2[d].moyo_size = -1;
dragon2[d].moyo_territorial_value = 0.0;
dragon2[d].safety = -1;
dragon2[d].escape_route = 0;
dragon2[d].heye = NO_MOVE;
dragon2[d].lunch = NO_MOVE;
dragon2[d].surround_status = 0;
set_eyevalue(&dragon2[d].genus, 0, 0, 0, 0);
dragon2[d].semeais = 0;
dragon2[d].semeai_defense_code = 0;
dragon2[d].semeai_defense_point = NO_MOVE;
dragon2[d].semeai_attack_code = 0;
dragon2[d].semeai_attack_point = NO_MOVE;
dragon2[d].owl_attack_point = NO_MOVE;
dragon2[d].owl_attack_code = 0;
dragon2[d].owl_attack_certain = 1;
dragon2[d].owl_defense_point = NO_MOVE;
dragon2[d].owl_defense_code = 0;
dragon2[d].owl_defense_certain = 1;
dragon2[d].owl_status = UNCHECKED;
dragon2[d].owl_threat_status = UNCHECKED;
dragon2[d].owl_second_attack_point = NO_MOVE;
dragon2[d].owl_second_defense_point = NO_MOVE;
}
dragon2_initialized = 1;
}
/* Examine which dragons are adjacent to each other. This is
* complicated by the fact that adjacency may involve a certain
* amount of empty space.
*
* The approach we use is to extend the dragons into their
* surrounding influence areas until they collide. We also accept
* one step extensions into neutral regions. After having done this
* we can look for immediate adjacencies.
*/
static void
find_neighbor_dragons()
{
int m, n;
int pos;
int pos2;
int i, j;
int d;
int dragons[BOARDMAX];
int distances[BOARDMAX];
int dist;
int k;
int color;
gg_assert(dragon2_initialized);
/* Initialize the arrays. */
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (IS_STONE(board[pos])) {
dragons[pos] = dragon[pos].id;
distances[pos] = 0;
}
else if (ON_BOARD(pos)) {
dragons[pos] = -1;
distances[pos] = -1;
}
}
/* Expand from dist-1 to dist. Break out of the loop at the end if
* we couldn't expand anything. Never expand more than five steps.
*/
for (dist = 1; dist <= 5; dist++) {
int found_one = 0;
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
if (distances[pos] != dist-1 || dragons[pos] < 0)
continue;
color = DRAGON(dragons[pos]).color;
for (k = 0; k < 4; k++) {
pos2 = pos + delta[k];
if (!ON_BOARD1(pos2))
continue;
/* Consider expansion from (pos) to adjacent intersection
* (pos2).
*/
if (distances[pos2] >= 0 && distances[pos2] < dist)
continue; /* (pos2) already occupied. */
/* We can always expand the first step, regardless of influence. */
if (dist == 1
|| (whose_area(INITIAL_INFLUENCE(color), pos) == color
&& whose_area(INITIAL_INFLUENCE(color), pos2)
!= OTHER_COLOR(color))) {
/* Expansion ok. Now see if someone else has tried to
* expand here. In that case we indicate a collision by
* setting the dragon number to -2.
*/
if (distances[pos2] == dist) {
if (dragons[pos2] != dragons[pos])
dragons[pos2] = -2;
}
else {
dragons[pos2] = dragons[pos];
distances[pos2] = dist;
found_one = 1;
}
}
}
}
if (!found_one)
break;
}
if (0) {
for (m = 0; m < board_size; m++) {
for (n = 0; n < board_size; n++)
fprintf(stderr, "%3d", dragons[POS(m, n)]);
fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
for (m = 0; m < board_size; m++) {
for (n = 0; n < board_size; n++)
fprintf(stderr, "%3d", distances[POS(m, n)]);
fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
}
/* Now go through dragons to find neighbors. It suffices to look
* south and east for neighbors. In the case of a collision zone
* where dragons==-2 we set all the neighbors of this intersection
* as adjacent to each other.
*/
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
if (dragons[pos] == -2) {
int neighbors = 0;
int adjacent[4];
for (k = 0; k < 4; k++) {
pos2 = pos + delta[k];
if (ON_BOARD1(pos2) && dragons[pos2] >= 0)
adjacent[neighbors++] = dragons[pos2];
}
for (i = 0; i < neighbors; i++)
for (j = i+1; j < neighbors; j++)
add_adjacent_dragons(adjacent[i], adjacent[j]);
}
else if (dragons[pos] >= 0) {
if (ON_BOARD(NORTH(pos))) {
if (dragons[NORTH(pos)] >= 0
&& dragons[NORTH(pos)] != dragons[pos])
add_adjacent_dragons(dragons[pos], dragons[NORTH(pos)]);
}
if (ON_BOARD(EAST(pos))) {
if (dragons[EAST(pos)] >= 0
&& dragons[EAST(pos)] != dragons[pos])
add_adjacent_dragons(dragons[pos], dragons[EAST(pos)]);
}
}
}
if (0) {
for (d = 0; d < number_of_dragons; d++) {
gprintf("dragon %d at %1m:", d, dragon2[d].origin);
for (i = 0; i < dragon2[d].neighbors; i++)
gprintf(" %1m(%d)", dragon2[dragon2[d].adjacent[i]].origin,
dragon2[d].adjacent[i]);
gprintf("\n");
}
}
}
/* Add the dragons with id a and b as adjacent to each other. */
static void
add_adjacent_dragons(int a, int b)
{
gg_assert(a >= 0 && a < number_of_dragons
&& b >= 0 && b < number_of_dragons);
if (a == b)
return;
add_adjacent_dragon(a, b);
add_adjacent_dragon(b, a);
}
/* Add the dragon with id b as adjacent to a. */
static void
add_adjacent_dragon(int a, int b)
{
int i;
gg_assert(a >= 0 && a < number_of_dragons
&& b >= 0 && b < number_of_dragons);
/* If the array of adjacent dragons already is full, ignore
* additional neighbors.
*/
if (dragon2[a].neighbors == MAX_NEIGHBOR_DRAGONS)
return;
for (i = 0; i < dragon2[a].neighbors; i++)
if (dragon2[a].adjacent[i] == b)
return;
dragon2[a].adjacent[dragon2[a].neighbors++] = b;
if (DRAGON(a).color == OTHER_COLOR(DRAGON(b).color))
dragon2[a].hostile_neighbors++;
}
/* A dragon is considered invincible if it satisfies either of the two
* following conditions:
* a) At least two distinct eyespaces without topological halfeyes,
* marginal vertices, or tactically critical or alive opponent strings.
* Furthermore there may not be an owl attack of the dragon.
* b) At least one string which is unconditionally alive according to the
* unconditional_life() function in utils.c.
*
* For the requirement on opponent strings in a), see e.g.
* seki:404,408,409,413,504,604,908.
*/
static int
dragon_invincible(int dr)
{
struct eye_data *eye;
int eye_color;
int k;
int pos;
int strong_eyes = 0;
int mx[BOARDMAX];
ASSERT1(IS_STONE(board[dr]), dr);
/* First look for invincible strings in the dragon. */
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (ON_BOARD(pos) && is_same_dragon(pos, dr) && worm[pos].invincible)
return 1;
}
/* Can the dragon be owl attacked? */
if (DRAGON2(dr).owl_status != UNCHECKED && DRAGON2(dr).owl_status != ALIVE)
return 0;
/* Examine the eye spaces. */
if (board[dr] == BLACK) {
eye = black_eye;
eye_color = BLACK;
}
else {
eye = white_eye;
eye_color = WHITE;
}
memset(mx, 0, sizeof(mx));
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (board[pos] == board[dr] && is_same_dragon(pos, dr)) {
for (k = 0; k < 4; k++) {
int pos2 = pos + delta[k];
if (ON_BOARD(pos2)
&& eye[pos2].color == eye_color
&& eye[pos2].origin != NO_MOVE) {
if (eye[pos2].marginal
|| is_halfeye(half_eye, pos2))
mx[eye[pos2].origin] = 2; /* bad eye */
else if (mx[eye[pos2].origin] == 0)
mx[eye[pos2].origin] = 1; /* good eye */
if (board[pos2] == OTHER_COLOR(board[dr])
&& (!attack(pos2, NULL) || find_defense(pos2, NULL)))
mx[eye[pos2].origin] = 2; /* bad eye */
}
}
}
}
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
/* Necessary to check eye margins here since the loop above only
* considers margins which are directly adjacent to some stone of
* the dragon.
*/
if (mx[pos] == 1
&& eye[pos].msize == 0)
strong_eyes++;
}
if (strong_eyes >= 2)
return 1;
return 0;
}
/* A dragon looks inessential if it satisfies all of
* 1. Is a single string.
* 2. Is not owl substantial.
*
* FIXME: Probably need a better definition of INESSENTIAL dragons.
* There are cases where a string is owl insubstantial
* yet allowing it to be captured greatly weakens our
* position.
*/
static int
dragon_looks_inessential(int origin)
{
#if 0
int d;
int k;
#endif
if (dragon[origin].size != worm[origin].size)
return 0;
if (owl_substantial(origin))
return 0;
#if 0
/* This is a proposed modification which solves 13x13:72 but
* breaks buzco:5. It adds the two requirements:
*
* 3. Has no opponent neighbor with status better than DEAD.
* 4. Has no opponent neighbor with escape value bigger than 0.
*
* This probably needs to be revised before it's enabled.
*/
for (k = 0; k < DRAGON2(origin).neighbors; k++) {
d = DRAGON2(origin).adjacent[k];
if (DRAGON(d).color != board[origin]
&& (DRAGON(d).status != DEAD
|| dragon2[d].escape_route > 0))
return 0;
}
#endif
return 1;
}
/* Report which stones are alive if it's (color)'s turn to move. I.e.
* critical stones belonging to (color) are considered alive.
* A stone is dead resp. critical if the tactical reading code _or_ the
* owl code thinks so.
*/
static void
get_alive_stones(int color, signed char safe_stones[BOARDMAX])
{
int d;
get_lively_stones(color, safe_stones);
for (d = 0; d < number_of_dragons; d++) {
if (dragon2[d].safety == DEAD
|| (dragon2[d].safety == CRITICAL
&& board[dragon2[d].origin] == OTHER_COLOR(color))) {
mark_dragon(dragon2[d].origin, safe_stones, 0);
}
}
}
/* If the opponent's last move is a dead dragon, this is called a
* *thrashing dragon*. We must be careful because the opponent may be
* trying to trick us, so even though GNU Go thinks the stone is dead,
* we should consider attacking it, particularly if we are ahead.
*
* This function determines whether the last played move is part of a
* dead dragon. It also looks for dead friendly neighbors of the
* thrashing dragon, which are also considered as thrashing. The
* stones of the primary thrashing dragon are marked by 1 in the
* thrashing_stone[] array and its neighbors are marked by 2.
* Neighbors of neighbors are marked 3, and so on, up to at most
* distance 5.
*/
static void
identify_thrashing_dragons()
{
int k;
int dist;
int last_move;
int color;
thrashing_dragon = 0;
memset(thrashing_stone, 0, sizeof(thrashing_stone));
last_move = get_last_move();
if (last_move == NO_MOVE
|| dragon[last_move].status != DEAD)
return;
thrashing_dragon = dragon[last_move].origin;
DEBUG(DEBUG_DRAGONS, "thrashing dragon found at %1m\n", thrashing_dragon);
mark_dragon(thrashing_dragon, thrashing_stone, 1);
color = board[thrashing_dragon];
for (dist = 1; dist < 5; dist++) {
int pos;
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (board[pos] != color
|| dragon[pos].origin != pos
|| thrashing_stone[pos] != dist)
continue;
for (k = 0; k < DRAGON2(pos).neighbors; k++) {
int d = DRAGON2(pos).adjacent[k];
if (DRAGON(d).color == color
&& DRAGON(d).status == DEAD
&& thrashing_stone[dragon2[d].origin] == 0) {
DEBUG(DEBUG_DRAGONS,
"neighbor at distance %d of thrashing dragon found at %1m\n",
dist + 1, DRAGON(d).origin);
mark_dragon(DRAGON(d).origin, thrashing_stone,
(signed char)(dist + 1));
}
}
}
}
}
static void
set_dragon_strengths(const signed char safe_stones[BOARDMAX],
float strength[BOARDMAX])
{
int ii;
for (ii = BOARDMIN; ii < BOARDMAX; ii++)
if (ON_BOARD(ii)) {
if (safe_stones[ii]) {
ASSERT1(IS_STONE(board[ii]), ii);
strength[ii] = DEFAULT_STRENGTH
* (1.0 - 0.3 * DRAGON2(ii).weakness_pre_owl);
}
else
strength[ii] = 0.0;
}
}
/* Marks all inessential stones with INFLUENCE_SAFE_STONE, leaves
* everything else unchanged.
*/
void
mark_inessential_stones(int color, signed char safe_stones[BOARDMAX])
{
int ii;
for (ii = BOARDMIN; ii < BOARDMAX; ii++)
if (IS_STONE(board[ii])
&& (DRAGON2(ii).safety == INESSENTIAL
|| (worm[ii].inessential
/* FIXME: Why is the check below needed?
* Why does it use .safety, not .status? /ab
*/
&& ((DRAGON2(ii).safety != DEAD
&& DRAGON2(ii).safety != TACTICALLY_DEAD
&& DRAGON2(ii).safety != CRITICAL)
|| (DRAGON2(ii).safety == CRITICAL
&& board[ii] == color)))))
safe_stones[ii] = INFLUENCE_SAFE_STONE;
}
void
set_strength_data(int color, signed char safe_stones[BOARDMAX],
float strength[BOARDMAX])
{
gg_assert(IS_STONE(color) || color == EMPTY);
get_alive_stones(color, safe_stones);
set_dragon_strengths(safe_stones, strength);
mark_inessential_stones(color, safe_stones);
}
void
compute_dragon_influence()
{
signed char safe_stones[BOARDMAX];
float strength[BOARDMAX];
set_strength_data(BLACK, safe_stones, strength);
compute_influence(BLACK, safe_stones, strength, &initial_black_influence,
NO_MOVE, "initial black influence, dragons known");
break_territories(BLACK, &initial_black_influence, 1, NO_MOVE);
set_strength_data(WHITE, safe_stones, strength);
compute_influence(WHITE, safe_stones, strength, &initial_white_influence,
NO_MOVE, "initial white influence, dragons known");
break_territories(WHITE, &initial_white_influence, 1, NO_MOVE);
}
/* Compute dragon's genus, possibly excluding one given eye. To
* compute full genus, just set `eye_to_exclude' to NO_MOVE.
*/
void
compute_dragon_genus(int d, struct eyevalue *genus, int eye_to_exclude)
{
int pos;
int dr;
ASSERT1(IS_STONE(board[d]), d);
gg_assert(eye_to_exclude == NO_MOVE || ON_BOARD1(eye_to_exclude));
set_eyevalue(genus, 0, 0, 0, 0);
if (board[d] == BLACK) {
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
if (black_eye[pos].color == BLACK
&& black_eye[pos].origin == pos
&& (eye_to_exclude == NO_MOVE
|| black_eye[eye_to_exclude].origin != pos)
&& find_eye_dragons(pos, black_eye, BLACK, &dr, 1) == 1
&& is_same_dragon(dr, d)) {
TRACE("eye at %1m (%s) found for dragon at %1m--augmenting genus\n",
pos, eyevalue_to_string(&black_eye[pos].value), dr);
if (eye_to_exclude == NO_MOVE
&& (eye_move_urgency(&black_eye[pos].value)
> eye_move_urgency(genus)))
DRAGON2(d).heye = black_vital_points[pos].defense_points[0];
add_eyevalues(genus, &black_eye[pos].value, genus);
}
}
}
else {
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
if (white_eye[pos].color == WHITE
&& white_eye[pos].origin == pos
&& (eye_to_exclude == NO_MOVE
|| white_eye[eye_to_exclude].origin != pos)
&& find_eye_dragons(pos, white_eye, WHITE, &dr, 1) == 1
&& is_same_dragon(dr, d)) {
TRACE("eye at %1m (%s) found for dragon at %1m--augmenting genus\n",
pos, eyevalue_to_string(&white_eye[pos].value), dr);
if (eye_to_exclude == NO_MOVE
&& (eye_move_urgency(&white_eye[pos].value)
> eye_move_urgency(genus)))
DRAGON2(d).heye = white_vital_points[pos].defense_points[0];
add_eyevalues(genus, &white_eye[pos].value, genus);
}
}
}
}
/* Try to determine whether topologically false and half eye points
* contribute to territory even if the eye doesn't solidify. The purpose
* is to be able to distinguish between, e.g., these positions:
*
* |.OOOOO |.OOOOO
* |.O.XXO |.O.OXO
* |OOX.XO |OOX.XO
* |O*XXXO and |O*XXXO
* |OX.XOO |OX.XOO
* |X.XOO. |X.XOO.
* |.XXO.. |.XXO..
* +------ +------
*
* In the left one the move at * is a pure dame point while in the
* right one it is worth one point of territory for either player.
*
* In general the question is whether a topologically false eye vertex
* counts as territory or not and the answer depends on whether each
* string adjoining the eye is externally connected to at least one
* proper eye.
*
* This function loops over the topologically false and half eye
* vertices and calls connected_to_eye() for each adjoining string to
* determine whether they all have external connection to an eye. The
* result is stored in the false_eye_territory[] array.
*/
static void
analyze_false_eye_territory(void)
{
int pos;
int color;
int eye_color;
struct eye_data *eye;
int k;
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
false_eye_territory[pos] = 0;
/* The analysis only applies to false and half eyes. */
if (half_eye[pos].type == 0)
continue;
/* Determine the color of the eye. */
if (white_eye[pos].color == WHITE) {
color = WHITE;
eye_color = WHITE;
eye = white_eye;
}
else if (black_eye[pos].color == BLACK) {
color = BLACK;
eye_color = BLACK;
eye = black_eye;
}
else
continue;
/* Make sure we have a "closed" position. Positions like
*
* |XXXXXX.
* |OOOOOXX
* |.O.O*..
* +-------
*
* disqualify without further analysis. (* is a false eye vertex)
*/
for (k = 0; k < 4; k++)
if (ON_BOARD(pos + delta[k])
&& board[pos + delta[k]] != color
&& eye[pos + delta[k]].color != eye_color)
break;
if (k < 4)
continue;
/* Check that all adjoining strings have external connection to an
* eye.
*/
for (k = 0; k < 4; k++)
if (ON_BOARD(pos + delta[k])
&& board[pos + delta[k]] == color
&& !connected_to_eye(pos, pos + delta[k], color, eye_color, eye))
break;
if (k == 4) {
false_eye_territory[pos] = 1;
if (0)
gprintf("False eye territory at %1m\n", pos);
}
}
/* FIXME: This initialization doesn't really belong here but must be
* done somewhere within examine_position().
* The array is eventually filled by the endgame() function.
*/
for (pos = BOARDMIN; pos < BOARDMAX; pos++)
if (ON_BOARD(pos))
forced_backfilling_moves[pos] = 0;
}
/*
* This function (implicitly) finds the connected set of strings of a
* dragon, starting from (str) which is next to the analyzed halfeye
* at (pos). Strings are for this purpose considered connected if and
* only if they have a common liberty, which is not allowed to be the
* half eye itself or one of its diagonal neighbors. For these strings
* it is examined whether their liberties are parts of eyespaces worth
* at least two halfeyes (again not counting the eyespace at (pos)).
*
* The real work is done by the recursive function
* connected_to_eye_recurse() below.
*/
static int
connected_to_eye(int pos, int str, int color, int eye_color,
struct eye_data *eye)
{
signed char mx[BOARDMAX];
signed char me[BOARDMAX];
int k;
int halfeyes;
/* mx marks strings and liberties which have already been investigated.
* me marks the origins of eyespaces which have already been counted.
* Start by marking (pos) and the surrounding vertices in mx.
*/
memset(mx, 0, sizeof(mx));
memset(me, 0, sizeof(me));
mx[pos] = 1;
for (k = 0; k < 8; k++)
if (ON_BOARD(pos + delta[k]))
mx[pos + delta[k]] = 1;
halfeyes = 0;
connected_to_eye_recurse(pos, str, color, eye_color, eye, mx, me, &halfeyes);
if (halfeyes >= 2)
return 1;
return 0;
}
/* Recursive helper for connected_to_eye(). Stop searching when we
* have found at least two halfeyes.
*/
static void
connected_to_eye_recurse(int pos, int str, int color, int eye_color,
struct eye_data *eye, signed char *mx,
signed char *me, int *halfeyes)
{
int liberties;
int libs[MAXLIBS];
int r;
int k;
mark_string(str, mx, 1);
liberties = findlib(str, MAXLIBS, libs);
/* Search the liberties of (str) for eyespaces. */
for (r = 0; r < liberties; r++) {
if (eye[libs[r]].color == eye_color
&& libs[r] != pos
&& !me[eye[libs[r]].origin]) {
me[eye[libs[r]].origin] = 1;
*halfeyes += (min_eyes(&eye[libs[r]].value)
+ max_eyes(&eye[libs[r]].value));
}
}
if (*halfeyes >= 2)
return;
/* Search for new strings in the same dragon with a liberty in
* common with (str), and recurse.
*/
for (r = 0; r < liberties; r++) {
if (mx[libs[r]])
continue;
mx[libs[r]] = 1;
for (k = 0; k < 4; k++) {
if (ON_BOARD(libs[r] + delta[k])
&& board[libs[r] + delta[k]] == color
&& is_same_dragon(str, libs[r] + delta[k])
&& !mx[libs[r] + delta[k]])
connected_to_eye_recurse(pos, libs[r] + delta[k], color, eye_color,
eye, mx, me, halfeyes);
if (*halfeyes >= 2)
return;
}
}
}
/* print status info on all dragons. (Can be invoked from gdb)
*/
void
show_dragons(void)
{
int pos;
int k;
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
struct worm_data *w = &(worm[pos]);
if (!IS_STONE(board[pos]))
continue;
if (w->origin == pos) {
gprintf("%1m : (dragon %1m) %s string of size %d (%f), genus %d: (%d,%d,%d,%d)",
pos, dragon[pos].origin,
color_to_string(board[pos]),
w->size,
w->effective_size,
w->genus,
w->liberties,
w->liberties2,
w->liberties3,
w->liberties4);
if (w->cutstone == 1)
gprintf("%o - is a potential cutting stone\n");
else if (w->cutstone == 2)
gprintf("%o - is a cutting stone\n");
else
gprintf("%o\n");
if (w->cutstone2 > 0)
gprintf("- cutstone2 = %d\n", w->cutstone2);
for (k = 0; k < MAX_TACTICAL_POINTS; k++) {
if (w->attack_codes[k] == 0)
break;
gprintf("- attackable at %1m, attack code = %d\n",
w->attack_points[k], w->attack_codes[k]);
}
for (k = 0; k < MAX_TACTICAL_POINTS; k++) {
if (w->defense_codes[k] == 0)
break;
gprintf("- defendable at %1m, defend code = %d\n",
w->defense_points[k], w->defense_codes[k]);
}
for (k = 0; k < MAX_TACTICAL_POINTS; k++) {
if (w->attack_threat_codes[k] == 0)
break;
gprintf("- attack threat at %1m, attack threat code = %d\n",
w->attack_threat_points[k], w->attack_threat_codes[k]);
}
for (k = 0; k < MAX_TACTICAL_POINTS; k++) {
if (w->defense_threat_codes[k] == 0)
break;
gprintf("- defense threat at %1m, defense threat code = %d\n",
w->defense_threat_points[k], w->defense_threat_codes[k]);
}
if (w->lunch != NO_MOVE)
gprintf("... adjacent worm %1m is lunch\n", w->lunch);
if (w->inessential)
gprintf("- is inessential\n");
if (w->invincible)
gprintf("- is invincible\n");
if (is_ko_point(pos))
gprintf("- is a ko stone\n");
}
}
gprintf("%o\n");
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
struct dragon_data *dd = &(dragon[pos]);
struct dragon_data2 *d2;
if (!IS_STONE(board[pos]))
continue;
d2 = &(dragon2[dd->id]);
if (dd->origin == pos) {
gprintf("%1m : %s dragon size %d (%f), genus %s, escape factor %d, crude status %s, status %s, moyo size %d, moyo territory value %f, safety %s, weakness pre owl %f, weakness %f",
pos,
board[pos] == BLACK ? "B" : "W",
dd->size,
dd->effective_size,
eyevalue_to_string(&d2->genus),
d2->escape_route,
status_to_string(dd->crude_status),
status_to_string(dd->status),
d2->moyo_size,
d2->moyo_territorial_value,
status_to_string(d2->safety),
d2->weakness_pre_owl,
d2->weakness);
gprintf(", owl status %s\n", status_to_string(d2->owl_status));
if (d2->owl_status == CRITICAL) {
gprintf("... owl attackable at %1m, code %d\n",
d2->owl_attack_point, d2->owl_attack_code);
gprintf("... owl defendable at %1m, code %d\n",
d2->owl_defense_point, d2->owl_defense_code);
}
if (dd->status == CRITICAL && d2->semeais) {
if (d2->semeai_defense_point)
gprintf("... semeai defense move at %1m, result code %s\n",
d2->semeai_defense_point,
result_to_string(d2->semeai_defense_code));
if (d2->semeai_attack_point)
gprintf("... semeai attack move at %1m, result code %s\n",
d2->semeai_attack_point,
result_to_string(d2->semeai_attack_code));
}
gprintf("... neighbors");
for (k = 0; k < d2->neighbors; k++) {
int d = d2->adjacent[k];
gprintf(" %1m", dragon2[d].origin);
}
gprintf("\n");
if (d2->lunch != NO_MOVE)
gprintf("... adjacent worm %1m is lunch\n", d2->lunch);
}
}
}
static int new_dragon_origins[BOARDMAX];
/* Compute new dragons, e.g. after having made a move. This will not
* affect any global state.
*/
void
compute_new_dragons(int dragon_origins[BOARDMAX])
{
int pos;
int saved_cutting_points[BOARDMAX];
/* This is currently necessary in order not to mess up the
* worm[].cutstone2 field. See cutstone2_helper in
* patterns/helpers.c. On the other hand it shouldn't be very
* interesting to recompute dragons in the original position.
*/
gg_assert(stackp > 0);
memcpy(saved_cutting_points, cutting_points, sizeof(cutting_points));
memset(cutting_points, 0, sizeof(cutting_points));
for (pos = BOARDMIN; pos < BOARDMAX; pos++)
if (ON_BOARD(pos)) {
if (board[pos] == EMPTY)
new_dragon_origins[pos] = NO_MOVE;
else
new_dragon_origins[pos] = find_origin(pos);
}
find_cuts();
find_connections();
memcpy(cutting_points, saved_cutting_points, sizeof(cutting_points));
memcpy(dragon_origins, new_dragon_origins, sizeof(new_dragon_origins));
}
/* This gets called if we are trying to compute dragons outside of
* make_dragons(), typically after a move has been made.
*/
static void
join_new_dragons(int d1, int d2)
{
int pos;
/* Normalize dragon coordinates. */
d1 = new_dragon_origins[d1];
d2 = new_dragon_origins[d2];
/* If d1 and d2 are the same dragon, we do nothing. */
if (d1 == d2)
return;
ASSERT1(board[d1] == board[d2], d1);
ASSERT1(IS_STONE(board[d1]), d1);
/* Don't bother to do anything fancy with dragon origins. */
for (pos = BOARDMIN; pos < BOARDMAX; pos++)
if (ON_BOARD(pos) && new_dragon_origins[pos] == d2)
new_dragon_origins[pos] = d1;
}
/*
* join_dragons amalgamates the dragon at (d1) to the
* dragon at (d2).
*/
void
join_dragons(int d1, int d2)
{
int ii;
int origin; /* new origin */
/* If not called from make_dragons(), we don't work on the main
* dragon[] array.
*/
if (stackp > 0) {
join_new_dragons(d1, d2);
return;
}
/* Normalize dragon coordinates. */
d1 = dragon[d1].origin;
d2 = dragon[d2].origin;
/* If d1 and d2 are the same dragon, we do nothing. */
if (d1 == d2)
return;
ASSERT1(board[d1] == board[d2], d1);
gg_assert(dragon2_initialized == 0);
ASSERT1(IS_STONE(board[d1]), d1);
/* We want to have the origin pointing to the largest string of
* the dragon. If this is not unique, we take the "upper
* leftmost" one.
*/
if (worm[d1].size > worm[d2].size
|| (worm[d1].size == worm[d2].size
&& d1 < d2)) {
origin = d1;
DEBUG(DEBUG_DRAGONS, "joining dragon at %1m to dragon at %1m\n", d2, d1);
}
else {
origin = d2;
DEBUG(DEBUG_DRAGONS, "joining dragon at %1m to dragon at %1m\n", d1, d2);
}
dragon[origin].size = dragon[d2].size + dragon[d1].size;
dragon[origin].effective_size = (dragon[d2].effective_size
+ dragon[d1].effective_size);
/* Join the second next_worm_in_dragon chain at the end of the first one. */
{
int last_worm_origin_dragon = origin;
while (next_worm_list[last_worm_origin_dragon] != NO_MOVE)
last_worm_origin_dragon = next_worm_list[last_worm_origin_dragon];
if (origin == d1)
next_worm_list[last_worm_origin_dragon] = d2;
else
next_worm_list[last_worm_origin_dragon] = d1;
}
for (ii = BOARDMIN; ii < BOARDMAX; ii++) {
if (ON_BOARD(ii)
&& (dragon[ii].origin == d1 || dragon[ii].origin == d2))
dragon[ii].origin = origin;
}
}
/*
* compute_crude_status(pos) tries to determine whether the dragon
* at (pos) is ALIVE, DEAD, or UNKNOWN. The algorithm is not perfect
* and can give incorrect answers.
*
* The dragon is judged alive if its genus is >1. It is judged dead if
* the genus is <2, it has no escape route, and no adjoining string can
* be easily captured. Otherwise it is judged UNKNOWN. */
static enum dragon_status
compute_crude_status(int pos)
{
/* FIXME: We lose information when constructing true_genus. This
* code can be improved.
*/
struct eyevalue *genus = &DRAGON2(pos).genus;
int true_genus = max_eyes(genus) + min_eyes(genus);
int lunch = DRAGON2(pos).lunch;
gg_assert(dragon2_initialized);
/* If it has two sure eyes, everything is just dandy. */
if (true_genus > 3)
return ALIVE;
/* If the dragon consists of one worm, there is an attack, but
* no defense and there is less than one eye and one half eye,
* the situation is hopeless.
*/
if (dragon[pos].size == worm[pos].size
&& worm[pos].attack_codes[0] != 0
&& worm[pos].defense_codes[0] == 0
&& true_genus < 3)
return DEAD;
if (lunch != NO_MOVE
&& true_genus < 3
&& worm[lunch].defense_codes[0] != 0
&& DRAGON2(pos).escape_route < 5)
if (true_genus == 2 || worm[lunch].size > 2)
return CRITICAL;
if (lunch != NO_MOVE
&& true_genus >= 3)
return ALIVE;
if (lunch == NO_MOVE || worm[lunch].cutstone < 2) {
if (true_genus < 3
&& DRAGON2(pos).escape_route == 0
&& DRAGON2(pos).moyo_size < 5)
return DEAD;
if (true_genus == 3
&& DRAGON2(pos).escape_route < 5)
return CRITICAL;
}
if (DRAGON2(pos).moyo_territorial_value > 9.99)
return ALIVE;
return UNKNOWN;
}
/* The dragon escape measure. This is defined as follows.
*
* Let a PATH be a sequence of adjacent intersections that do nowhere
* touch or include an opponent stone or touch the border. It may
* include friendly stones and those are allowed to touch opponent
* stones or the border). Let a DISTANCE N INTERSECTION be an
* intersection connected to a dragon by a path of length N, but by no
* shorter path. The connection of the path to the dragon may either
* be by direct adjacency or, in the first step, diagonally if both
* adjoining intersections are empty.
*
* It is assumed that each intersection has an escape value, which
* would typically depend on influence and (preliminary) dragon
* status. We define the escape potential as the sum of the escape
* values over the distance four intersections of the dragon.
*
* Example of distance N intersections, 1 <= N <= 4:
*
* . . . . . . . . . . . . . . . . . .
* . . . . . X . . O . . . . . X . . O
* . . X . . . . . O . . X . 2 . 4 . O
* X . . . . . . . . X . . 1 1 2 3 4 .
* X O . O . . . . O X O 1 O 1 2 3 4 O
* X O . O . . . . . X O 1 O 1 . 4 . .
* X O . . . X . O O X O 1 . . X . . O
* . . . X . . . . . . 1 . X . . . . .
* X . . . . X . . . X . . . . X . . .
* . . . . . . . . . . . . . . . . . .
*
* Additionally, a path may not pass a connection inhibited
* intersection.
*/
#define ENQUEUE(pos) (queue[queue_end++] = (pos),\
mx[pos] = 1)
/* Compute the escape potential described above. The dragon is marked
* in the goal array.
*/
int
dragon_escape(signed char goal[BOARDMAX], int color,
signed char escape_value[BOARDMAX])
{
int ii;
int k;
static int mx[BOARDMAX];
static int mx_initialized = 0;
int queue[MAX_BOARD * MAX_BOARD];
int queue_start = 0;
int queue_end = 0;
int other = OTHER_COLOR(color);
int distance;
int escape_potential = 0;
gg_assert(IS_STONE(color));
if (!mx_initialized) {
memset(mx, 0, sizeof(mx));
mx_initialized = 1;
}
/* Enter the stones of the dragon in the queue. */
for (ii = BOARDMIN; ii < BOARDMAX; ii++)
if (ON_BOARD(ii) && goal[ii])
ENQUEUE(ii);
/* Find points at increasing distances from the dragon. At distance
* four, sum the escape values at those points to get the escape
* potential.
*/
for (distance = 0; distance <= 4; distance++) {
int save_queue_end = queue_end;
while (queue_start < save_queue_end) {
ii = queue[queue_start];
queue_start++;
/* Do not pass connection inhibited intersections. */
if (cut_possible(ii, OTHER_COLOR(color)))
continue;
if (distance == 4)
escape_potential += escape_value[ii];
else {
if (ON_BOARD(SOUTH(ii))
&& !mx[SOUTH(ii)]
&& (board[SOUTH(ii)] == color
|| (board[SOUTH(ii)] == EMPTY
&& ON_BOARD(SE(ii)) && board[SE(ii)] != other
&& ON_BOARD(SS(ii)) && board[SS(ii)] != other
&& ON_BOARD(SW(ii)) && board[SW(ii)] != other)))
ENQUEUE(SOUTH(ii));
if (ON_BOARD(WEST(ii))
&& !mx[WEST(ii)]
&& (board[WEST(ii)] == color
|| (board[WEST(ii)] == EMPTY
&& ON_BOARD(SW(ii)) && board[SW(ii)] != other
&& ON_BOARD(WW(ii)) && board[WW(ii)] != other
&& ON_BOARD(NW(ii)) && board[NW(ii)] != other)))
ENQUEUE(WEST(ii));
if (ON_BOARD(NORTH(ii))
&& !mx[NORTH(ii)]
&& (board[NORTH(ii)] == color
|| (board[NORTH(ii)] == EMPTY
&& ON_BOARD(NW(ii)) && board[NW(ii)] != other
&& ON_BOARD(NN(ii)) && board[NN(ii)] != other
&& ON_BOARD(NE(ii)) && board[NE(ii)] != other)))
ENQUEUE(NORTH(ii));
if (ON_BOARD(EAST(ii))
&& !mx[EAST(ii)]
&& (board[EAST(ii)] == color
|| (board[EAST(ii)] == EMPTY
&& ON_BOARD(NE(ii)) && board[NE(ii)] != other
&& ON_BOARD(EE(ii)) && board[EE(ii)] != other
&& ON_BOARD(SE(ii)) && board[SE(ii)] != other)))
ENQUEUE(EAST(ii));
/* For distance one intersections, allow kosumi to move out. I.e.
*
* ??..
* X.*.
* ?O.?
* ??X?
*
*/
if (distance == 0) {
if (board[SOUTH(ii)] == EMPTY
&& board[WEST(ii)] == EMPTY
&& !mx[SW(ii)]
&& (board[SW(ii)] == color
|| (board[SW(ii)] == EMPTY
&& ON_BOARD(SOUTH(SW(ii)))
&& board[SOUTH(SW(ii))] != other
&& ON_BOARD(WEST(SW(ii)))
&& board[WEST(SW(ii))] != other)))
ENQUEUE(SW(ii));
if (board[WEST(ii)] == EMPTY
&& board[NORTH(ii)] == EMPTY
&& !mx[NW(ii)]
&& (board[NW(ii)] == color
|| (board[NW(ii)] == EMPTY
&& ON_BOARD(WEST(NW(ii)))
&& board[WEST(NW(ii))] != other
&& ON_BOARD(NORTH(NW(ii)))
&& board[NORTH(NW(ii))] != other)))
ENQUEUE(NW(ii));
if (board[NORTH(ii)] == EMPTY
&& board[EAST(ii)] == EMPTY
&& !mx[NE(ii)]
&& (board[NE(ii)] == color
|| (board[NE(ii)] == EMPTY
&& ON_BOARD(NORTH(NE(ii)))
&& board[NORTH(NE(ii))] != other
&& ON_BOARD(EAST(NE(ii)))
&& board[EAST(NE(ii))] != other)))
ENQUEUE(NE(ii));
if (board[EAST(ii)] == EMPTY
&& board[SOUTH(ii)] == EMPTY
&& !mx[SE(ii)]
&& (board[SE(ii)] == color
|| (board[SE(ii)] == EMPTY
&& ON_BOARD(EAST(SE(ii)))
&& board[EAST(SE(ii))] != other
&& ON_BOARD(SOUTH(SE(ii)))
&& board[SOUTH(SE(ii))] != other)))
ENQUEUE(SE(ii));
}
}
}
}
/* Reset used mx cells. */
for (k = 0; k < queue_end; k++) {
/* The assertion fails if the same element should have been queued
* twice, which might happen if ENQUEUE() is called without
* checking mx[].
*/
ASSERT1(mx[queue[k]] == 1, queue[k]);
mx[queue[k]] = 0;
}
return escape_potential;
}
/* Wrapper to call the function above and compute the escape potential
* for the dragon at (pos).
*/
static int
compute_escape(int pos, int dragon_status_known)
{
int ii;
signed char goal[BOARDMAX];
signed char escape_value[BOARDMAX];
signed char safe_stones[BOARDMAX];
ASSERT1(IS_STONE(board[pos]), pos);
for (ii = BOARDMIN; ii < BOARDMAX; ii++)
if (ON_BOARD(ii))
goal[ii] = is_same_dragon(ii, pos);
/* Compute escape_value array. Points are awarded for moyo (4),
* area (2) or EMPTY (1). Values may change without notice.
*/
get_lively_stones(OTHER_COLOR(board[pos]), safe_stones);
compute_escape_influence(board[pos], safe_stones, NULL, 0, escape_value);
/* If we can reach a live group, award 6 points. */
for (ii = BOARDMIN; ii < BOARDMAX; ii++) {
if (!ON_BOARD(ii))
continue;
if (dragon_status_known) {
if (dragon[ii].crude_status == ALIVE)
escape_value[ii] = 6;
else if (dragon[ii].crude_status == UNKNOWN
&& (DRAGON2(ii).escape_route > 5
|| DRAGON2(ii).moyo_size > 5))
escape_value[ii] = 4;
}
else {
if (board[ii] == board[pos]
&& !goal[ii]
&& worm[ii].attack_codes[0] == 0)
escape_value[ii] = 2;
}
}
return dragon_escape(goal, board[pos], escape_value);
}
/*
* Sum up the surrounding moyo sizes for each dragon. For this
* we retrieve the moyo data stored in influence_data (*q) (which must
* have been computed previously) from the influence module.
* We set dragon2[].moyo_size and .moyo_value if it is smaller than the
* current entry.
*
* Currently this is implemented differently depending on whether
* experimental connections are used or not. The reason why this is
* needed is that most of the B patterns in conn.db are disabled for
* experimental connections, which may cause the moyo segmentation to
* pass through cutting points between dragons, making the surrounding
* moyo size mostly useless. Instead we only use the part of the
* surrounding moyo which is closest to some worm of the dragon.
*/
static void
compute_surrounding_moyo_sizes(const struct influence_data *q)
{
int pos;
int d;
int k;
int moyo_color;
float moyo_sizes[BOARDMAX];
float moyo_values[BOARDMAX];
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
moyo_sizes[pos] = 0.0;
moyo_values[pos] = 0.0;
}
for (pos = BOARDMIN; pos < BOARDMAX; pos++) {
if (!ON_BOARD(pos))
continue;
moyo_color = whose_moyo_restricted(q, pos);
if (moyo_color == board[pos])
continue;
if (moyo_color == WHITE) {
for (k = 0; k < number_close_white_worms[pos]; k++) {
int w = close_white_worms[pos][k];
int dr = dragon[w].origin;
moyo_sizes[dr] += 1.0 / number_close_white_worms[pos];
moyo_values[dr] += (gg_min(influence_territory(q, pos, WHITE), 1.0)
/ number_close_white_worms[pos]);
}
}
if (moyo_color == BLACK) {
for (k = 0; k < number_close_black_worms[pos]; k++) {
int w = close_black_worms[pos][k];
int dr = dragon[w].origin;
moyo_sizes[dr] += 1.0 / number_close_black_worms[pos];
moyo_values[dr] += (gg_min(influence_territory(q, pos, BLACK), 1.0)
/ number_close_black_worms[pos]);
}
}
}
for (d = 0; d < number_of_dragons; d++) {
int this_moyo_size = (int) moyo_sizes[dragon2[d].origin];
float this_moyo_value = moyo_values[dragon2[d].origin];
if (this_moyo_size < dragon2[d].moyo_size) {
dragon2[d].moyo_size = this_moyo_size;
dragon2[d].moyo_territorial_value = this_moyo_value;
}
}
}
static struct interpolation_data moyo_value2weakness =
{ 5, 0.0, 15.0, {1.0, 0.65, 0.3, 0.15, 0.05, 0.0}};
static struct interpolation_data escape_route2weakness =
{ 5, 0.0, 25.0, {1.0, 0.6, 0.3, 0.1, 0.05, 0.0}};
static struct interpolation_data genus2weakness =
{ 6, 0.0, 3.0, {1.0, 0.95, 0.8, 0.5, 0.2, 0.1, 0.0}};
float
crude_dragon_weakness(int safety, struct eyevalue *genus, int has_lunch,
float moyo_value, float escape_route)
{
/* FIXME: We lose information when constructing true_genus. This
* code can be improved.
*/
float true_genus = 0.5 * (max_eyes(genus) + min_eyes(genus)
+ (has_lunch != 0));
float weakness_value[3];
float weakness;
int i, j;
if (safety == INVINCIBLE || safety == INESSENTIAL)
return 0.0;
if (safety == TACTICALLY_DEAD || safety == DEAD || safety == CRITICAL)
return 1.0;
weakness_value[0] = gg_interpolate(&moyo_value2weakness, moyo_value);
weakness_value[1] = gg_interpolate(&escape_route2weakness, escape_route);
weakness_value[2] = gg_interpolate(&genus2weakness, true_genus);
DEBUG(DEBUG_DRAGONS,
" moyo value %f -> %f, escape %f -> %f, eyes %f -> %f\n",
moyo_value, weakness_value[0],
escape_route, weakness_value[1],
true_genus, weakness_value[2]);
for (i = 0; i < 3; i++)
for (j = i + 1; j < 3; j++)
if (weakness_value[j] < weakness_value[i]) {
float tmp = weakness_value[i];
weakness_value[i] = weakness_value[j];
weakness_value[j] = tmp;
}
/* The overall weakness is mostly, but not completely determined by the
* best value found so far:
*/
weakness = gg_min(0.7 * weakness_value[0] + 0.3 * weakness_value[1],
1.3 * weakness_value[0]);
gg_assert(weakness >= 0.0 && weakness <= 1.0);
return weakness;
}
/* This function tries to guess a coefficient measuring the weakness of
* a dragon. This coefficient * the effective size of the dragon can be
* used to award a strategic penalty for weak dragons.
*/
static float
compute_dragon_weakness_value(int d)
{
int origin = dragon2[d].origin;
float weakness;
/* Possible ingredients for the computation:
* '+' means currently used, '-' means not (yet?) used
* - pre-owl moyo_size
* + post-owl moyo_size and its territory value
* + escape factor
* + number of eyes
* - minus number of vital attack moves?
* + from owl:
* + attack certain?
* - number of owl nodes
* - maybe reading shadow?
* + threat to attack?
* - possible connections to neighbour dragons
*/
DEBUG(DEBUG_DRAGONS, "Computing weakness of dragon at %1m:\n", origin);
weakness = crude_dragon_weakness(dragon2[d].safety, &dragon2[d].genus,
dragon2[d].lunch != NO_MOVE,
dragon2[d].moyo_territorial_value,
(float) dragon2[d].escape_route);
/* Now corrections due to (uncertain) owl results resp. owl threats. */
if (!dragon2[d].owl_attack_certain)
weakness += gg_min(0.25 * (1.0 - weakness), 0.25 * weakness);
if (!dragon2[d].owl_defense_certain)
weakness += gg_min(0.25 * (1.0 - weakness), 0.25 * weakness);
if (dragon2[d].owl_threat_status == CAN_THREATEN_ATTACK)
weakness += 0.15 * (1.0 - weakness);
if (weakness < 0.0)
weakness = 0.0;
if (weakness > 1.0)
weakness = 1.0;
DEBUG(DEBUG_DRAGONS, " result: %f.\n", weakness);
return weakness;
}
/* This function has to be called _after_ the owl analysis and the
* subsequent re-run of the influence code.
*/
void
compute_refined_dragon_weaknesses()
{
int d;
/* Compute the surrounding moyo sizes. */
for (d = 0; d < number_of_dragons; d++)
dragon2[d].moyo_size = 2 * BOARDMAX;
/* Set moyo sizes according to initial_influence. */
compute_surrounding_moyo_sizes(&initial_black_influence);
compute_surrounding_moyo_sizes(&initial_white_influence);
for (d = 0; d < number_of_dragons; d++)
dragon2[d].weakness = compute_dragon_weakness_value(d);
}
/* The strategic size is the effective size, plus a bonus for all weak
* neighbouring dragons of the opponent.
*/
void
compute_strategic_sizes()
{
float *bonus = calloc(number_of_dragons, sizeof(float));
int d;
int k;
for (d = 0; d < number_of_dragons; d++) {
/* Compute bonus for all neighbors of dragon (d). The total bonus for
* all neighbors is effective_size(d) * weakness(d), and it is given
* to a neighbor d2 proportionally to the value of
* effective_size(d2) * weakness(d2).
*/
float sum = 0.0;
if (dragon2[d].safety == INESSENTIAL)
continue;
for (k = 0; k < dragon2[d].neighbors; k++) {
int d2 = dragon2[d].adjacent[k];
if (board[dragon2[d2].origin] == OTHER_COLOR(board[dragon2[d].origin])
&& dragon2[d2].safety != INESSENTIAL)
sum += DRAGON(d2).effective_size * dragon2[d2].weakness;
}
if (sum == 0.0)
continue;
for (k = 0; k < dragon2[d].neighbors; k++) {
int d2 = dragon2[d].adjacent[k];
if (board[dragon2[d2].origin] == OTHER_COLOR(board[dragon2[d].origin])
&& dragon2[d2].safety != INESSENTIAL) {
bonus[d2] += ((DRAGON(d2).effective_size * dragon2[d2].weakness) / sum)
* DRAGON(d).effective_size * dragon2[d].weakness;
if (0)
gprintf("Dragon %1m receives %f effective size bonus from %1m.\n",
dragon2[d2].origin,
((DRAGON(d2).effective_size * dragon2[d2].weakness) / sum)
* DRAGON(d).effective_size * dragon2[d].weakness,
dragon2[d].origin);
}
}
}
for (d = 0; d < number_of_dragons; d++) {
if (0)
gprintf("Dragon %1m gets effective size bonus of %f.\n",
dragon2[d].origin, bonus[d]);
/* We cap strategic size at 3 * effective_size. (This is ad hoc.) */
dragon2[d].strategic_size = gg_min(bonus[d] + DRAGON(d).effective_size,
3 * DRAGON(d).effective_size);
}
free(bonus);
}
/*
* Test whether two dragons are the same. Used by autohelpers and elsewhere.
*/
int
is_same_dragon(int d1, int d2)
{
if (d1 == NO_MOVE || d2 == NO_MOVE)
return (d1 == d2);
ASSERT_ON_BOARD1(d1);
ASSERT_ON_BOARD1(d2);
return (dragon[d1].origin == dragon[d2].origin);
}
/* Test whether two dragons are neighbors. */
int
are_neighbor_dragons(int d1, int d2)
{
int k;
d1 = dragon[d1].origin;
d2 = dragon[d2].origin;
for (k = 0; k < DRAGON2(d1).neighbors; k++)
if (dragon2[DRAGON2(d1).adjacent[k]].origin == d2)
return 1;
/* Just to be make sure that this function is always symmetric, we
* do it the other way round too.
*/
for (k = 0; k < DRAGON2(d2).neighbors; k++)
if (dragon2[DRAGON2(d2).adjacent[k]].origin == d1)
return 1;
return 0;
}
/* Mark the stones of a dragon. */
void
mark_dragon(int pos, signed char mx[BOARDMAX], signed char mark)
{
int w;
for (w = first_worm_in_dragon(dragon[pos].origin); w != NO_MOVE;
w = next_worm_in_dragon(w))
mark_string(w, mx, mark);
}
/* The following two functions allow to traverse all worms in a dragon:
* for (ii = first_worm_in_dragon(pos); ii != NO_MOVE;
* ii = next_worm_in_dragon(ii);)
* ...
* At the moment first_worm_in_dragon(pos) will always be the origin
* of the dragon, but you should not rely on that.
*/
int
first_worm_in_dragon(int d)
{
return dragon[d].origin;
}
int
next_worm_in_dragon(int w)
{
ASSERT1(worm[w].origin == w, w);
return next_worm_list[w];
}
/* ================================================================ */
/* A few status functions */
/* ================================================================ */
/*
* These functions are only here because then we don't need to expose
* the dragon structure to the external program.
*/
enum dragon_status
crude_status(int pos)
{
return dragon[pos].crude_status;
}
enum dragon_status
dragon_status(int pos)
{
return dragon[pos].status;
}
int
lively_dragon_exists(int color)
{
if (color == WHITE)
return lively_white_dragons > 0;
else
return lively_black_dragons > 0;
}
/* Is this dragon weak? */
int
dragon_weak(int pos)
{
ASSERT_ON_BOARD1(pos);
/* FIXME: This should not happen, but avoids a crash. What is
* the proper fix for calling this at stackp != 0 ?
*/
if (dragon[pos].id < 0 || dragon[pos].id >= number_of_dragons)
return 1;
return (DRAGON2(pos).weakness > 0.40001);
}
/* Returns the size of the biggest critical dragon on the board. */
int
size_of_biggest_critical_dragon(void)
{
int str;
int max_size = 0;
for (str = BOARDMIN; str < BOARDMAX; str++)
if (ON_BOARD(str)) {
if (board[str] == EMPTY
|| dragon[str].origin != str)
continue;
/* Get the best available status for the dragon */
if (dragon[str].status == CRITICAL) {
if (dragon[str].size >= max_size)
max_size = dragon[str].size;
}
}
return max_size;
}
/************************************************************************
* A list of all cuts found during connection matching *
************************************************************************/
#define MAX_CUTS 3 * MAX_BOARD * MAX_BOARD
struct cut_data {
int apos;
int bpos;
int move;
};
static int num_cuts = 0;
static struct cut_data cut_list[MAX_CUTS];
static void
clear_cut_list()
{
num_cuts = 0;
}
/* Store in the list that (move) disconnects the two strings at
* apos and bpos.
*/
void
add_cut(int apos, int bpos, int move)
{
gg_assert(board[apos] == board[bpos]);
if (num_cuts == MAX_CUTS)
return;
if (apos > bpos) {
int tmp = apos;
apos = bpos;
bpos = tmp;
}
if (move == NO_MOVE)
return;
cut_list[num_cuts].apos = apos;
cut_list[num_cuts].bpos = bpos;
cut_list[num_cuts].move = move;
num_cuts++;
if (0)
gprintf("Added %d-th cut at %1m between %1m and %1m.\n", num_cuts,
move, apos, bpos);
}
/* For every move in the cut list disconnecting two of opponent's strings,
* test whether the two strings can be connected at all. If so, add a
* CUT_MOVE reason.
*/
void
cut_reasons(int color)
{
int k;
for (k = 0; k < num_cuts; k++)
if (board[cut_list[k].apos] == OTHER_COLOR(color)
&& !is_same_dragon(cut_list[k].apos, cut_list[k].bpos)
&& string_connect(cut_list[k].apos, cut_list[k].bpos, NULL) == WIN)
add_cut_move(cut_list[k].move, cut_list[k].apos, cut_list[k].bpos);
}
/* ================================================================ */
/* Debugger functions */
/* ================================================================ */
/* For use in gdb, print details of the dragon at (m, n).
* Add this to your .gdbinit file:
*
* define dragon
* set ascii_report_dragon("$arg0")
* end
*
* Now 'dragon S8' will report the details of the S8 dragon.
*
*/
void
ascii_report_dragon(char *string)
{
int pos = string_to_location(board_size, string);
if (!ON_BOARD(pos))
fprintf(stderr, "unknown position %s\n", string);
else
report_dragon(stderr, pos);
}
void
report_dragon(FILE *outfile, int pos)
{
int w;
int k;
struct dragon_data *d = &(dragon[pos]);
struct dragon_data2 *d2 = &(dragon2[d->id]);
if (board[pos] == EMPTY) {
gprintf("There is no dragon at %1m\n", pos);
return;
}
if (d->id < 0) {
gprintf("Dragon data not available at %1m\n", pos);
return;
}
gfprintf(outfile, "color %s\n", color_to_string(d->color));
gfprintf(outfile, "origin %1m\n", d->origin);
gfprintf(outfile, "size %d\n", d->size);
gfprintf(outfile, "effective_size %f\n", d->effective_size);
gfprintf(outfile, "strategic_size %f\n", d2->strategic_size);
gfprintf(outfile, "genus %s\n",
eyevalue_to_string(&d2->genus));
gfprintf(outfile, "heye %1m\n", d2->heye);
gfprintf(outfile, "escape_route %d\n", d2->escape_route);
gfprintf(outfile, "lunch %1m\n", d2->lunch);
gfprintf(outfile, "crude_status %s\n",
status_to_string(d->crude_status));
gfprintf(outfile, "owl_status %s\n",
status_to_string(d2->owl_status));
gfprintf(outfile, "status %s\n",
status_to_string(d->status));
gfprintf(outfile, "safety %s\n",
status_to_string(d2->safety));
gfprintf(outfile, "weakness %f\n", d2->weakness);
gfprintf(outfile, "weakness_pre_owl %f\n", d2->weakness_pre_owl);
gfprintf(outfile, "surround_status %d\n", d2->surround_status);
gfprintf(outfile, "surround_size %d\n", d2->surround_size);
gfprintf(outfile, "moyo_size %d\n", d2->moyo_size);
gfprintf(outfile, "moyo_territorial_value %f\n",
d2->moyo_territorial_value);
gfprintf(outfile, "neighbors ");
for (k = 0; k < d2->neighbors; k++)
gfprintf(outfile, "%1m ", DRAGON(d2->adjacent[k]).origin);
gfprintf(outfile, "\nhostile_neighbors %d\n", d2->hostile_neighbors);
gfprintf(outfile, "owl_attack_code %d\n", d2->owl_attack_code);
gfprintf(outfile, "owl_attack_point %1m\n", d2->owl_attack_point);
gfprintf(outfile, "owl_attack_certain %s\n",
(d2->owl_attack_certain) ? "YES" : "NO");
gfprintf(outfile, "owl_2nd_attack_point %1m\n",
d2->owl_second_attack_point);
gfprintf(outfile, "owl_threat_status %s\n",
status_to_string(d2->owl_threat_status));
gfprintf(outfile, "owl_defense_code %d\n", d2->owl_defense_code);
gfprintf(outfile, "owl_defense_point %1m\n", d2->owl_defense_point);
gfprintf(outfile, "owl_defense_certain %s\n",
(d2->owl_defense_certain) ? "YES" : "NO");
gfprintf(outfile, "owl_2nd_defense_point %1m\n",
d2->owl_second_defense_point);
gfprintf(outfile, "owl_attack_kworm %1m\n", d2->owl_attack_kworm);
gfprintf(outfile, "owl_defense_kworm %1m\n", d2->owl_defense_kworm);
gfprintf(outfile, "semeais %d\n", d2->semeais);
gfprintf(outfile, "semeai_defense_code %d\n", d2->semeai_defense_code);
gfprintf(outfile, "semeai_defense_point %1m\n", d2->semeai_defense_point);
gfprintf(outfile, "semeai_defense_certain %d\n",
d2->semeai_defense_certain);
gfprintf(outfile, "semeai_defense_target %1m\n",
d2->semeai_defense_target);
gfprintf(outfile, "semeai_attack_code %d\n", d2->semeai_attack_code);
gfprintf(outfile, "semeai_attack_point %1m\n", d2->semeai_attack_point);
gfprintf(outfile, "semeai_attack_certain %d\n", d2->semeai_attack_certain);
gfprintf(outfile, "semeai_attack_target %1m\n", d2->semeai_attack_target);
gfprintf(outfile, "strings ");
for (w = first_worm_in_dragon(pos); w != NO_MOVE; w = next_worm_in_dragon(w))
gfprintf(outfile, "%1m ", w);
gfprintf(outfile, "\n");
}
/*
* Local Variables:
* tab-width: 8
* c-basic-offset: 2
* End:
*/
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