Hi,
I seem to have encountered a bug in GNU Go 3.8 (3.8-9build3 from Ubuntu
19.10,
to be precise). I was using it with cgoban 1.9.14 (i.e. the old one, not
the
Java one) and stumbled upon the following output:
***assertion failure:
board.c:1173 - board[pos] == EMPTY near A2***
(variation 3799)
A B C D E F G H J
9 . . . . . . . . . 9
8 O X X . . . . . . 8
7 O O + X X . + . . 7
6 . O O . O X . . . 6
5 O X O . O X . . . 5
4 . X O . O X . . . 4
3 O X X O . O X X X 3
2 O X X X O O X O . 2 WHITE (O) has captured 4 stones
1 O O X . X O O . O 1 BLACK (X) has captured 1 stones
A B C D E F G H J
(;GM[1]FF[4]SZ[9]KM[5.5]HA[0]GN[GNU Go 3.8 stepped on a bug]
;B[fd];W[ee];B[fe];W[ef];B[dc];W[cd];B[gg];W[fh];B[cg];W[cf];B[bf];W[ce]
;B[eg];W[fg];B[dh];W[eh];B[bh];W[dg];B[ff];W[di];B[ch];W[ed];B[ec];W[hh]
;B[bb];W[bc];B[hg];W[ag];B[be];W[bd];B[ad];W[ab];B[ci];W[ah];B[bg];W[ae]
;B[ai];W[bi];B[ei];W[ai];B[cb];W[ac];B[gh];W[gi];B[hi];W[ii];B[ig];W[fi]
)
gnugo 3.8 (seed 1740963255): You stepped on a bug.
It may have to do with me using Undo. Attached is the SGF file produced
by
cgoban.
Thanks for this great tool. Still being used 36 years later.
Kind Regards, Daniel Müller.
(;GM[1]FF[3]
RU[Japanese]SZ[9]HA[0]KM[5.5]
PW[White]
PB[Black]
GN[White (W) vs. Black (B)]
DT[2025-03-03]
SY[Cgoban 1.9.14]TM[30:00(5x1:00)];B[fd]BL[1800];W[ee]WL[1799];B[fe]
BL[1800];W[ef]WL[1796];B[dc]BL[1800];W[cd]WL[1794];B[gg]BL[1800];W[fh]
WL[1793];B[cg]BL[1800];W[cf]WL[1792];B[bf]BL[1799];W[ce]WL[1787];B[eg]
BL[1799];W[fg]WL[1785];B[dh]BL[1797];W[eh]WL[1778];B[bh]BL[1796]
(;W[dg]WL[1761];B[ff]BL[1795];W[di]WL[1758];B[ch]BL[1794];W[ed]
WL[1756];B[ec]BL[1794];W[hh]WL[1754];B[bb]BL[1794];W[bc]WL[1748];B[hg]
BL[1794];W[ag]WL[1735];B[be]BL[1793];W[bd]WL[1732];B[ad]BL[1792];W[ab]
WL[1730];B[ci]BL[1792];W[ah]WL[1726];B[bg]BL[1791];W[ae]WL[1716];B[ai]
BL[1790];W[bi]WL[1708];B[ei]BL[1789];W[ai]WL[1701];B[cb]BL[1788];W[ac]
WL[1697];B[gh]BL[1788];W[gi]WL[1695];B[hi]BL[1787];W[ii]WL[1692];B[ig]
BL[1787];W[fi]WL[1690])
(;W[ed]WL[1770];B[dg]BL[1795])
)
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