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.

gnugo/regression/games/seki_exotics/README

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+Files in this directory have not yet been used in tests.
+
+
+

gnugo/regression/games/seki_exotics/README-MANNER

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+
+Some remarks concerning the files collected:
+
+seki1.sgf
+
+The "classical" seki. gnugo plays correctly, but the score is wrong.
+
+seki2.sgf
+
+Each side has an eye
+
+seki3.sgf
+
+Another one.
+
+seki_stupid.sgf
+
+Here i wanted to see, if gnugo plays the stupid move C 1. Well it doesnt.
+But maybe it is good to keep the file, just to make sure that future
+"improvements" dont spoil it.
+
+sekichallenge.sgf
+
+Thats what it is. gnugo makes mistakes and loses everything. But i get
+the impression that the reading depth is just a little bit too short.
+
+seki_score.sgf
+
+a seki. unless i counted it wrongly, assuming an equal number of
+prisoners
+the japanese rules give:
+
+territory b 96  w 97
+prisoners b  0  w  0
+seki      b  0  w  0
+
+the chinese rules give:
+
+territory b 96  w 97
+stones    b 79  w 79
+seki      b 8.5 w 1.5
+
+so there is a difference of 7 points, depending on which rules you take.
+
+twoko_seki1.sgf
+
+A double ko seki. with the present program and playing japanese rules
+the eternal loop can only be avoided, if both players have enough
+intelligence to see that it is impossible to win. i said already
+before that i think that the program is wrong. that is after two
+passes, i thought the game is finished, but do_pass allows gnugo
+to play another move, so the loop continues. if we change do_pass,
+it would be good enough to have one intelligent player to avoid
+the loop. Since we know nothing about the intelligence of our
+opponent, the intelligent player would have to be gnugo.
+So if we stick to japanese rules, this needs a detailed analysis
+of the situation.
+In principle the japanese rules define in their precedents
+that this position is seki, should gnugo know the precedents ?
+chinese rules avoid the loop and give the interesting result, that
+whoever insists on playing, loses everything. maybe not everybody
+knows that already by heart, so it goes like this:
+
+w takes ko 1
+b takes ko 2
+w tenuki
+b takes ko 1
+w takes ko 2
+b tenuki
+
+finally there will be no playable point left on the board.
+lets assume that b has played the last possible move.
+then if w insists:
+
+w takes ko 1
+b takes ko 2
+w passes
+b takes ko 1
+
+now w would like to take ko 2, but that is forbidden, because it
+reproduces a position, which has already existed before.
+so
+
+w passes
+b takes all.
+
+If there is another ko somewhere else on the board, then this
+double ko would be an example of what Ing calls a disturbing ko.
+
+
+twoko_seki2.sgf
+
+Another double ko seki. twoko_seki1 has two groups with an eye each,
+this one has one liberty common to both groups.
+
+twoko_live.sgf
+
+B is alive.
+
+
+twoko_dead.sgf
+
+W is dead.
+
+
+fourko.sgf
+
+A quadruple ko. I have never heard about that, but i guess the
+japanese will have to cancel the game. with chinese rules one
+can play it of course, but it is rather tricky.
+
+onadare_ko.sgf
+
+The double ko variation of the onadare joseki.
+
+onadare_ko2.sgf
+
+Here i have added a ko in the lower right corner. This is completely
+different from twoko_seki1.sgf plus another ko. here the black group
+in the double ko is alive. however white has an unlimited supply
+of ko threats, so it will win any other ko. If i understand this
+correctly, the japanese do not consider this to be a triple ko
+I thought that Ing should call the double ko a "fighting ko",
+but apparently he doesnt. So the Ing rules would have to treat
+the two cases twoko_seki1.sgf plus another ko and the present one
+the same way.
+gnugo does not know how to handle this.
+
+bent4.sgf
+
+gnugo handles this correctly. when i said maybe for the wrong reasons
+Gunnar said, what do i mean. well first one should look, if it does
+all possible variations correctly. But what i really was afraid of, was
+maybe it treats it the same way it handles seki. only for seki it is
+wrong and here it is right. anyway, whenever the seki has been fixed, 
+one should look, if this is still ok.
+
+bent4_2.sgf
+
+Another one. This one is also handled correctly.
+
+
+seki_bent4.sgf
+
+The combination of a bent4 with a seki, which gives an unremovable
+ko threat. The japanese rules kill the bent4 anyway. gnugo has
+various difficulties.
+
+
+doublebent4.sgf
+
+I guess the japanese rules say that both groups are dead ???
+Apart from that gnugo handles it correctly.
+
+threeko1.sgf
+
+The "classical" triple ko. i guess, if we play japanese rules,
+gnugo should realise that the game should be cancelled.
+Playing chinese rules one can usually neutralise two ko's
+and then play the one which is remaining as before.
+
+threeko2.sgf
+
+This is a fake. white can never win this.
+
+threeko3.sgf
+
+Similar to threeko2.sgf, with a slight difference. If it is
+white's turn it can play B 5 and then it becomes a double ko
+which black cannot win.
+If it is black's turn, the japanese will cancel the game and
+for the chinese white can never win.
+
+chosei.sgf
+
+A chosei( long life / eternal life ).
+Apart from the fact that the game should be cancelled,
+gnugo makes a lot of mistakes and loses everything.
+It seems everybody who writes about that, shows the same diagram.
+Maybe this is the only one ?
+If people think that this is interesting, I would have to do
+some work.
+
+junkan-ko.sgf
+
+A junkan-ko (round robin ko). Everything I wrote about chosei
+is valid here as well. i thought a little about these positions,
+but i dont want to bore everybody, unless somebody really wants
+to hear about it.

gnugo/regression/games/seki_exotics/bent4.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ea][eb][ec][ed][ee][af][bf][ef][ff][bg][fg][bh][ch][dh][fh][di][fi]
+AB[da][db][dc][dd][ae][be][ce][de][cf][cg][dg][eg][ah][eh][bi][ei]
+)

gnugo/regression/games/seki_exotics/bent4_2.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[fa][fb][fc][fd][fe][af][bf][cf][ff][cg][dg][eg][fg][fh][ai][bi][ci][fi]
+AB[ga][gb][gc][gd][ge][he][gf][ag][bg][gg][bh][ch][dh][eh][gh][ei][gi]
+)

gnugo/regression/games/seki_exotics/chosei.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[bf][cf][df][ef][ff][hf][fg][bh][ch][dh][gh][hh][bi][fi]
+AB[bg][cg][dg][eg][ah][eh][fh][di][gi]
+PL[B]
+)

gnugo/regression/games/seki_exotics/doublebent4.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[aa][ba][fa][ga][ab][fb][gb][hb][dc][ec]
+[fc][gc][dd][ed][fd][gd][hd][id][ae][be][ce][de]
+AB[da][ea][ia][bb][cb][db][eb][ib][bc][cc]
+[ic][ad][bd][cd][ee][fe][ge][he][ie][af][bf][cf][df][ef]
+)

gnugo/regression/games/seki_exotics/fourko.sgf

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+(;GM[1]FF[4]RU[Japanese]SZ[9]HA[0]
+;AW[be][ce][de][ee][fe][af][bf][ff][gf][ag]
+[eg][gg][ah][bh][fh][gh][ai][ci][gi]
+AB[ad][bd][cd][dd][ed][fd][gd][ae][ge][he]
+[cf][df][ef][hf][bg][dg][hg][ch][dh][eh][hh][di][fi][hi]
+)

gnugo/regression/games/seki_exotics/junkan-ko.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[da][ga][ha][db][eb][hb][dc][fc][hc][dd]
+[fd][hd][de][ee][he][df][hf][dg][hg][dh][eh][hh][fi][gi][hi]
+AB[ca][fa][cb][fb][gb][cc][gc][cd][gd][ce]
+[fe][ge][cf][ef][gf][cg][eg][gg][ch][fh][gh][ci][di][ei]
+)

gnugo/regression/games/seki_exotics/onadare_ko.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[19]HA[0]
+;B[cd];W[ed];B[ec];W[dd];B[dc];W[ce];B[fc];W[fd];B[gd];W[cc];B[bd];
+W[cb];B[bc];W[gc];B[hc];W[bb];B[be];W[gb];B[fb];W[hb];B[db];W[ic];
+B[ge];W[ef];B[cf];W[ff];B[ie];W[lc];B[hg];W[ei];B[tt];W[da];B[ea];
+W[ba];B[ga];W[ha];B[ab]
+)

gnugo/regression/games/seki_exotics/onadare_ko2.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[19]HA[0]
+;AW[ba][da][ha][bb][cb][gb][hb][cc][gc][ic]
+[lc][dd][ed][fd][ce][ef][ff][ei][no][oo]
+[po][qo][ro][so][mp][np][jq][kq][lq][mq]
+[pq][qq][rq][sq][jr][or][qr][sr][js][ps][qs][rs][ss]
+;AB[ea][ga][ab][db][fb][bc][dc][ec][fc][hc]
+[bd][cd][gd][be][ge][ie][cf][hg][op][pp]
+[qp][rp][sp][nq][oq][kr][lr][mr][nr][ks][ms][os]
+PL[W]
+)

gnugo/regression/games/seki_exotics/seki1.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[fa][fb][fc][fd][gd][ge][gf][ag][bg][cg]
+[dg][eg][fg][gg][gh][bi][ci][di][gi]
+AB[ga][gb][hb][ib][gc][hc][hd][he][hf][hg]
+[ah][bh][ch][dh][eh][fh][hh][fi][hi]
+)

gnugo/regression/games/seki_exotics/seki2.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+(
+;AW[fa][fb][fc][fd][fe][df][ef][ff][gf][ag]
+[bg][cg][gg][ah][ch][gh][ai][bi][ci][gi]
+AB[ea][cb][eb][cc][ec][cd][ed][ce][de][ee]
+[af][bf][cf][dg][eg][fg][dh][fh][ei][fi]
+)
+)

gnugo/regression/games/seki_exotics/seki3.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ca][ea][cb][db][eb][ac][bc][cc][fc][gc]
+[cd][dd][gd][ce][fe][ge][ef][gf][hf][bg][eg]
+[fg][ig][ah][bh][fh][hh][ei][fi][gi][hi]
+AB[ba][fa][ab][fb][gb][hb][dc][ec][hc][ad]
+[bd][ed][fd][hd][be][de][ee][he][ie][af][bf]
+[cf][df][if][dg][ch][dh][eh][gh][bi][di]
+)

gnugo/regression/games/seki_exotics/seki_bent4.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[da][ha][ab][cb][db][hb][bc][cc][hc][ad]
+[bd][gd][be][ce][ge][he][ie][gf][eg][fg][gg][eh][ih][ei][hi]
+AB[ba][ea][ga][bb][eb][gb][dc][ec][gc][cd]
+[dd][fd][ae][de][fe][af][bf][cf][ef][ff]
+[hf][if][dg][hg][dh][fh][gh][hh][di][fi]
+PL[W]
+)

gnugo/regression/games/seki_exotics/seki_challenge.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ac][bc][cc][dc][ec][ed][ae][be][ee][fe]
+[bf][ff][bg][dg][fg][gg][hg][bh][dh][fh][hh][bi][di][hi]
+AB[ad][bd][cd][dd][de][cf][df][ef][ag][cg]
+[eg][ah][ch][eh][gh][ai][ci][fi][gi]
+)

gnugo/regression/games/seki_exotics/seki_score.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[19]HA[0]
+(
+;AW
+[la][pa][lb][pb][lc][pc][sc][ld][md][nd]
+[od][pd][qd][rd][sd][aj][bj][cj][dj][ej]
+[fj][gj][hj][ij][jj][kj][lj][mj][nj][oj]
+[pj][qj][rj][sj][cm][km][lm][an][bn][hn]
+[in][jn][mn][nn][on][qn][co][do][eo][fo]
+[go][po][dp][jp][mp][qp][rp][sp][iq][jq]
+[kq][lq][mq][nq][ar][br][fr][gr][hr][nr]
+[or][rr][sr][bs][cs][ds][es][os][rs]
+AB
+[ka][kb][kc][kd][ae][be][ce][de][ee][fe]
+[ge][he][ie][je][ke][le][me][ne][oe][pe]
+[qe][re][se][sf][ai][bi][ci][di][ei][fi]
+[gi][hi][ii][ji][ki][li][mi][ni][oi][pi]
+[qi][ri][si][kn][ln][ao][bo][ho][io][jo]
+[mo][no][oo][ap][cp][ep][fp][gp][ip][kp]
+[lp][np][pp][aq][bq][dq][fq][gq][hq][oq]
+[qq][rq][sq][cr][dr][er][pr][qr][ps]
+)
+)

gnugo/regression/games/seki_exotics/seki_stupid.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[ad][bd][cd][ce][de][ee][fe][ge][gf][cg][dg][eg][gg][bh][ch][eh][gh][di][ei][gi]
+AB[ae][be][bf][cf][df][ef][ff][ag][bg][fg][ah][fh][bi][fi]
+PL[B]
+)

gnugo/regression/games/seki_exotics/threeko1.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ce][de][ee][af][bf][cf][ef][ff][bg][dg]
+[fg][ah][fh][gh][gi]
+AB[bd][cd][dd][ed][fd][ae][be][fe][ge][gf]
+[cg][eg][gg][hg][bh][ch][dh][eh][hh][ai][bi][di][fi][hi]
+PL[B]
+)

gnugo/regression/games/seki_exotics/threeko2.sgf

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+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ae][ce][de][ee][bf][cf][ef][ff][ag][bg]
+[dg][fg][ah][fh][gh][gi]
+AB[ad][bd][cd][dd][ed][fd][be][fe][ge][gf]
+[cg][eg][gg][hg][bh][ch][dh][eh][hh][ai][bi][di][fi][hi]
+)

gnugo/regression/games/seki_exotics/threeko3.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[ba][ea][fa][ha][bb][fb][gb][bc][ec][fc]
+[bd][dd][fd][ae][ee][fe][bf][cf][df][dg][dh][di]
+AB[ca][da][ia][cb][eb][hb][ib][cc][dc][gc]
+[hc][cd][gd][ce][de][ge][ef][ff][gf][eg][eh][ei]
+)

gnugo/regression/games/seki_exotics/twoko_dead.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+(
+;AW[ba][ab][cb][bc][ad]
+AB[ca][ea][db][cc][ec][bd][cd][ae][bf]
+)
+)

gnugo/regression/games/seki_exotics/twoko_live.sgf

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+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[aa][ca][ea][bb][eb][ec][ed][ae][be][ce][de][ee]
+AB[da][ab][cb][db][bc][dc][ad][bd][cd][dd]
+PL[W]
+)

gnugo/regression/games/seki_exotics/twoko_seki1.sgf

@@ -0,0 +1,6 @@
+(;GM[1]FF[3]RU[Japanese]SZ[9]HA[0]
+;AW[ae][be][ce][de][ee][fe][af][ef][ff][gf]
+[ag][eg][gg][ah][bh][fh][gh][ai][ci][gi]
+AB[ad][bd][cd][dd][ed][fd][gd][ge][he][bf]
+[cf][df][hf][bg][dg][hg][ch][dh][eh][hh][di][fi][hi]
+)

gnugo/regression/games/seki_exotics/twoko_seki2.sgf

@@ -0,0 +1,6 @@
+(;GM[1]FF[3]SZ[9]RU[Japanese]HA[0]
+;AW[ha][hb][hc][hd][he][af][bf][df][ef][ff]
+[hf][bg][cg][dg][fg][hg][ah][gh][hh][gi]
+AB[ga][gb][gc][gd][ae][be][ce][de][ee][fe]
+[ge][cf][gf][eg][gg][bh][dh][fh][ai][bi][ci][di][ei][fi]
+)