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. 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 > computer-go@computer-go.org > http://www.computer-go.org/mailman/listinfo/computer-go/ _______________________________________________ computer-go mailing list computer-go@computer-go.org http://www.computer-go.org/mailman/listinfo/computer-go/
