I think that the original description of the position should have said 'killable' rather than 'dead', and that David missed the fact that it is White to move.
At 08:06 27/03/2008, Hideki wrote:
David Fotland: <[EMAIL PROTECTED]>: >I just looked at this position and it looks like a win for black in the >first position. Many Faces evaluates it as a win for black, and plays c1 to >save the lower left black group with almost no thinking time. > >Mogo is correct because the lower left black group is not dead. I'm sorry if wrong but the black seems dead by B5 after C1, isn't it? -Hideki >David > >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:computer-go- >> [EMAIL PROTECTED] On Behalf Of Matthew Woodcraft >> Sent: Sunday, March 09, 2008 11:49 AM >> To: computer-go >> Subject: [computer-go] Life and Death >> >> I've included two 13x13 positions below. In both positions it is >> Black's >> move. >> >> The first position is simplified from a real game. Black has two >> enclosed dead groups, and White has a small but easy win. >> >> The second position is a modified version of the first in which the >> dead >> groups are more obviously dead. >> >> If I try MogoRelease3 playing as Black on position 2, it shows a 20% >> score and resigns either immediately or after a couple of moves. >> >> If I try it on position 1, it shows a score of 70%+ for Black, and >> continues to play until White takes steps to remove the dead groups >> from >> the board. I've tested with up to 2^24 playouts. >> >> I have tried increasing --collectorLimitTreeSize and --limitTreeSize >> (like bigMogo in the scalability study), but I can't set them much >> higher than the default on this machine without running out of memory. >> >> I'd be interested to see if someone with a bigger computer can find out >> what resources it needs to judge this position well, and to see how >> other engines do. >> >> Position 1 >> >> (;GM[1]FF[4] >> CA[UTF-8] >> SZ[13] >> HA[0] >> KM[0.5] >> AB[jb:kb][cb:cc][kc][bd:cd][jd:ld][be][he][cf:df][bg][gb:gh] >> [ig:ih][jh:kh][eg:ei][li][aj:bj][hi:hj][lk][al][ck:cl][ji:jl] >> [dm][im] >> AW[ia:ja][ib][hc:jc][db:dd][hd:id][ce:de][ie][ke:le][bf][hf:jf] >> [lf][jg:kg][mg][lh][ai:di][gi][mi][cj][ej:gj][ij][dk:fk][hk:ik] >> [dl][il][bm][fl:fm][hm] >> ) >> >> Position 2 >> >> (;GM[1]FF[4] >> CA[UTF-8] >> SZ[13] >> HA[0] >> KM[0.5] >> AB[jb:mb][cb:cc][kc][bd:cd][jd:md][be][he][cf:df][bg][gb:gh] >> [ig:ih][jh:kh][eg:ei][li][aj:bj][hi:hj][bk:ck][lk][al][cl] >> [ji:jl][im] >> AW[ia:la][ib][hc:jc][mc][db:dd][hd:id][ce:de][ie][ke:le][bf] >> [hf:jf][lf][jg:kg][mg][lh][ai:di][gi][mi][cj][ej:gj][ij][dk:fk] >> [hk:ik][dl][fl][il][bm:cm][em:fm][hm] >> ) >> >> -M- >> _______________________________________________ >> computer-go mailing list >> [email protected] >> http://www.computer-go.org/mailman/listinfo/computer-go/ > >_______________________________________________ >computer-go mailing list >[email protected] >http://www.computer-go.org/mailman/listinfo/computer-go/ -- [EMAIL PROTECTED] (Kato) _______________________________________________ computer-go mailing list [email protected] http://www.computer-go.org/mailman/listinfo/computer-go/ -- This email has been verified as Virus free. Virus Protection and more available at http://www.plus.net
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