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[computer-go] Super Ko on KGS ignores player to move
Hi,
When testing my go program on KGS with Chinese rules, I noticed that
super ko does not take the player to move into consideration. It seems
that not all programs have the same behaviour in this respect. LeGoBot
has a problem with this, as can be seen in this game:
http://kgs.kiseido.com/games/2005/7/22/LeGoBot-CrazyStone-2.sgf
I had to resign the game on behalf of CrazyStone to unlock LeGoBot. I
noticed that GNU Go has the same problem when started with
--chinese-rules. Maybe gnugo has an option that I missed ? In this game,
it wanted to play J3 at the end, which my program refused:
(;FF[4]CA[ISO8859_1]GM[1]GN[cs0001-01-87]AP[TwoGtp:0.7.1]SZ[9]KM[6.5]RE[W+9.5]
PB[GNU Go:3.6]PW[Crazy Stone - CMCSearchPlayer:0001.01]DT[2005-08-13]
C[Black\: gnugo --mode gtp --chinese-rules
White\: ./cs0001-01
Result[Black\]\: W+9.5
Result[White\]\: W+9.5
Host\: zizi.grappa.univ-lille3.fr
Date\: Saturday, August 13, 2005 1\:39\:16 AM CEST]
;B[ee];W[dg];B[eg];W[eh];B[df];W[cc];B[fg];W[cg];B[fh];W[ed]
;B[bg];W[cf];B[bf];W[de];B[ch];W[ef];B[dh];W[be];B[fe];W[bh]
;B[gc];W[ei];B[bi];W[ff];B[gf];W[ah];B[df];W[ef];B[fi];W[fd]
;B[gd];W[cd];B[eb];W[fc];B[fb];W[gb];B[ba];W[hc];B[hd];W[he]
;B[ge];W[db];B[ec];W[dd];B[da];W[ha];B[ib];W[ca];B[cb];W[dc]
;B[hb];W[ga];B[ea];W[bb];B[ab];W[ca];B[ag];W[af];B[cb];W[bc]
;B[ca];W[ac];B[ic];W[aa];B[ff];W[fa];B[ci];W[id];B[df];W[ie]
;B[ef];W[ia];B[hc];W[ai];B[di];W[eh];B[ei];W[ag];B[tt];W[hg]
;B[tt];W[hf];B[hh];W[ih];B[hi];W[ea];B[tt];W[gh];B[tt];W[gg]
;B[ig];W[if];B[tt];W[ii];B[ig];W[ae];B[tt];W[ih];B[tt];W[ii])
Also, in this game:
http://kgs.kiseido.com/games/2005/8/1/SchokoBot-CrazyStone.sgf
There was a seki at the end. This game was played with Japanese rules,
so there may be a different rule for superko here. Instead of passing,
if playing as White, my program would have played J1 and killed the
black group (since D4 is super ko and cannot be played). If there is a
superko rule, then I guess there is no seki anymore and one of the two
groups has to die.
To summarize:
* Programmers, beware of KGS's behavior with respect to super ko in
Chinese games.
* Is there an option in gnugo so that it plays with KGS rules ?
Rémi
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