[gnugo-devel] Gnugo Bug

[April Hersey]

Hello,

I'm working with Peter Drake on improving his program Orego, which we regularly
test against Gnugo with no problems. Today, however, we received the following
error during a game:

Cyclic point redistribution detected.


***assertion failure:
move_reasons.c:1389 - 0 near C2***

 (variation 3571)
   A B C D E F G H J K L M N O P Q R S T
19 X X . X . X O O . . . . . . . . . . . 19
18 O X X . X X O . O . O . . . . . . . . 18
17 O O O X . . X O O . X O X . . O . . . 17
16 O . O X X X X X O O O O . X X + . . . 16
15 . O O X X O O X X X X X O O O . O . X 15
14 O O O O X . O O O O O X O X O . . . . 14
13 O X O X X . O O X X X X O X X O . . . 13
12 O X X X . X . . . . X X X . X O O . . 12
11 O O O X X X O O O O X O . . X O . O . 11     WHITE (O) has captured 27 stones
10 . . O O O X X X O + O . O X X O O O . 10     BLACK (X) has captured 10 stones
 9 O O . O O O X X X O O O X X O O . O . 9
 8 . O . O . O O X X . . X X . X X O O O 8
 7 . . O O O X X X X . . . . . . . X X X 7
 6 O O O O O O O O O X . . . X X X . X X 6
 5 . O . O . O X X X X . X X O . . X . X 5
 4 O O O O O X X X . X . X O O O O . X X 4
 3 O X X X O O X O X X X X O O X O O O . 3
 2 X . . O O . O O O X X . X X X X X O . 2
 1 . X . . O O O O O O X X . X . O O . O 1
   A B C D E F G H J K L M N O P Q R S T
(;GM[1]FF[4]SZ[19]KM[7.5]HA[0]GN[GNU Go 3.7.11 stepped on a bug]
;B[qm];W[dp];B[gd];W[pc];B[lp];W[qe];B[ch];W[ic];B[fr];W[nq];B[rp];W[no]
;B[gp];W[lr];B[en];W[cn];B[bm];W[dm];B[qk];W[lc];B[eb];W[bn];B[el];W[bl]
;B[jn];W[if];B[pr];W[gf];B[ef];W[pp];B[mr];W[mq];B[nr];W[qq];B[lq];W[kr]
;B[oq];W[op];B[qr];W[rq];B[np];W[mp];B[mo];W[np];B[lo];W[rr];B[rs];W[qs]
;B[jr];W[ro];B[rn];W[jq];B[qo];W[ms];B[kq];W[ir];B[ns];W[ss];B[or];W[js]
;B[jp];W[em];B[iq];W[pq];B[ls];W[ks];B[jr];W[ms];B[is];W[hs];B[ls];W[jq]
;B[hr];W[ms];B[fm];W[hq];B[jr];W[gr];B[jq];W[fq];B[gq];W[eq];B[hp];W[hr]
;B[ls];W[ps];B[is];W[js];B[nj];W[fn];B[so];W[fl];B[gm];W[ek];B[fs];W[er]
;B[mh];W[gl];B[cf];W[qh];B[il];W[fe];B[dc];W[ij];B[kh];W[kj];B[lj];W[kk]
;B[ll];W[gn];B[hm];W[hn];B[im];W[mf];B[oh];W[pg];B[ks];W[es];B[fd];W[rj]
;B[hj];W[ii];B[eo];W[fo];B[fp];W[ep];B[hk];W[lk];B[mk];W[li];B[lh];W[hi]
;B[ki];W[mj];B[jj];W[jk];B[nk];W[gb];B[ik];W[ji];B[fh];W[id];B[bj];W[rk]
;B[ig];W[gg];B[jg];W[hg];B[he];W[ge];B[hd];W[hf];B[ie];W[jf];B[je];W[kf]
;B[ee];W[rl];B[pn];W[ql];B[pl];W[bk];B[ke];W[cj];B[lf];W[gi];B[fj];W[bi]
;B[le];W[me];B[fi];W[af];B[kg];W[be];B[gj];W[bc];B[on];W[pk];B[ol];W[pj]
;B[kc];W[kb];B[hb];W[hc];B[gc];W[ib];B[ho];W[do];B[fb];W[ha];B[dh];W[ld]
;B[ng];W[of];B[cb];W[kd];B[bb];W[ab];B[bg];W[ag];B[io];W[pi];B[oi];W[bf]
;B[bh];W[ah];B[fa];W[ce];B[eg];W[df];B[de];W[cg];B[da];W[cd];B[nf];W[ne]
;B[ba];W[ga];B[sn];W[jd];B[ed];W[ej];B[di];W[dj];B[rm];W[mg];B[ei];W[sl]
;B[og];W[ph];B[sm];W[fk];B[oj];W[dn];B[lg];W[cc];B[go];W[in];B[dd];W[ci]
;B[gk];W[ac];B[hl];W[ok];B[aa];W[cf];B[dg];W[gs];B[jo];W[is];B[ml];W[ad]
;B[nn];W[ai];B[aj];W[ak];B[al];W[dl];B[ck];W[en];B[nd];W[oe];B[od];W[dk]
;B[cl];W[cm];B[am];W[an];B[ao];W[bo];B[sp];W[ap];B[mc];W[fs];B[kr];W[bp]
;B[se];W[qj];B[dq];W[ri];B[bs];W[dr];B[cq];W[cp];B[bq];W[aq];B[ar]
)
gnugo 3.7.11 (seed 1279928760): You stepped on a bug.
Please mail this message, including the debug output above, to address@hidden

- April Hersey