[gnugo-devel] This game crashes gnugo 3.4

[Hillis, David (Civ,ARL/CISD)]

Hello,
     First I would like to thank the Gnugo team for providing 
this great program. I have found it invaluable both as a 
benchmark to test my own Go engine against and as an inspiration
that maybe some day my program may play as well.

        My research into using co-evolution (genetic algorithms)
to learn game playing strategies often detours into research
on using co-evolution to find novel ways of breaking things. 
I don't know if it's novel, but a version of my Go engine 
seems to have learned how to crash Gnugo version 3.4.
        Here is one such game with Gnugo playing white.

(;GM[1]FF[4] 
SZ[9] GN[GNU Go 3.4 Random Seed 1080657971 level 10] 
DT[2004-03-30] 
KM[0.0]HA[0]AP[GNU Go:3.4]RU[Japanese] 
;B[ee];W[cf];B[dg];W[cc];B[cg];W[fc];B[gd];W[gc];B[bf]
;W[hd];B[ce];W[he];B[df];W[hg];B[ge];W[fg];B[gf];W[eh]
;B[gg];W[gh];B[hf];W[hh];B[bd];W[bi];B[bc];W[cb];B[bb]
;W[if];B[cd];W[dc];B[hc];W[ig];B[hb])

        If you load this game into Gnugo 3.4 and then type
'playwhite'
you'll get a windows "Program Error" dialog box saying 
"gnugo.exe has generated errors..."

        If you knock out the last black and white moves 
and load this
(;GM[1]FF[4] 
SZ[9] GN[GNU Go 3.4 Random Seed 1080657971 level 10] 
DT[2004-03-30] 
KM[0.0]HA[0]AP[GNU Go:3.4]RU[Japanese] 
;B[ee];W[cf];B[dg];W[cc];B[cg];W[fc];B[gd];W[gc];B[bf]
;W[hd];B[ce];W[he];B[df];W[hg];B[ge];W[fg];B[gf];W[eh]
;B[gg];W[gh];B[hf];W[hh];B[bd];W[bi];B[bc];W[cb];B[bb]
;W[if];B[cd];W[dc];B[hc])
Then type 'playwhite'; gnugo will move to j3.
Typing h8 will then trigger the error.

Regards,
Dave Hillis
address@hidden