Re: [gnugo-devel] Terrible move

[Trevor Morris]

At 06:25 PM 11/19/2001 +0000, Allan Crossman wrote:
>Here's a game where GNU Go makes a fairly catastrophic move at move 216. 
>The odd thing is that if asked to generate a black move instead it sees 
>that it can kill...
Yes, but the problem is that the owl code thinks the white group's already
dead!  This is definitely a problem.


Here's a curious position, derived from your submission:

$ gq -l c:\\y.sgf --decide-dragon S15 -o x.sgf
finished examine_position
S15 cannot be attacked (8 variations)
S15 cannot be defended (2 variations)

In other words, if black plays first White's alive.  If white plays
first, he's dead.    Yikes.

-Trevor

c:\\y.sgf:

(
;
FF[4]
GM[1]
SZ[19]
AP[Jago:Version 4.18]
PB[GNU Go 3.0.0]
PW[GNU Go 3.1.14][GNU Go 3.1.14]
AW[ac][ag][bc][bd][bf][cd][ci][co][cs][dd][dg][dh][di][dj][dm][do][dp][dq][d
s][ee][eg][ek][el][em][en][eq][er][es][fc][fe][fg][fp][gd][gh][gl][hb][hc][h
d][hg][hq][ia][ib][if][ig][ik][in][ja][jf][ji][jj][jl][jm][jp][jr][js][kf][k
g][ki][kn][ko][kq][ks][lg][lh][lj][lo][lp][ls][ma][mg][mi][mj][mk][na][nj][o
a][oc][oh][ok][pa][pb][pc][pd][pj][pk][pm][qd][qf][qj][qm][qp][qr][rd][re][r
f][rg][ri][rj][rl][sg][sh][si][sj][sk][sl]
AB[ad][ae][af][be][bh][bi][bo][br][bs][ce][cf][cg][ch][cj][ck][cm][cn][cp][c
q][cr][de][df][dk][dl][dn][dr][ef][ff][fq][ge][gf][gg][he][hf][ic][id][ie][j
b][jc][je][jk][ka][ke][kj][kk][kl][km][kr][la][lb][lf][ll][ln][lq][lr][mb][m
e][mh][ml][mm][mo][mp][mr][ms][nb][nc][nd][nf][ng][nh][ni][nk][nl][nm][nn][o
b][od][of][oi][oj][ol][oq][pe][pf][pg][pi][pl][po][pp][pr][qe][qg][qh][qi][q
k][ql][qo][qq][rb][rc][rh][rk][rm][rn][rq][sm]
)