[gnugo-devel] Odd move choice (bug?)

[Allan Crossman]

Hi,

I suppose at this stage you're not too keen to adjust the engine or 
anything, but I've seen a move so odd I wonder if there's a bug behind it.
 The problem is move 206 made by White (3.1.32). It misses N16 and plays 
N15 instead.

I've gotten 3.0.0 to look at the position and it chooses the correct move.

(;GM[1]FF[4]SZ[19]KM[0.5]
PW[GNU Go 3.1.32]
PB[GNU Go 3.0.0]
;B[pd];W[dp];B[pp];W[dd];B[pj];W[nq];B[lq];W[qq];B[qp];W[pq]
;B[op];W[rq];B[np];W[nr];B[lo];W[rp];B[cf];W[qo];B[cn];W[nc]
;B[lc];W[qc];B[qd];W[pc];B[od];W[rc];B[nd];W[nb];B[le];W[fd]
;B[bd];W[cc];B[ci];W[cl];B[cq];W[dq];B[cp];W[do];B[cr];W[dn]
;B[bn];W[el];B[hc];W[bc];B[gq];W[rd];B[go];W[gl];B[jn];W[il]
;B[mr];W[fc];B[ce];W[kl];B[nn];W[lk];B[gb];W[li];B[lg];W[ni]
;B[ph];W[qe];B[qm];W[rh];B[qn];W[po];B[of];W[jg];B[jd];W[kh]
;B[nk];W[fi];B[rj];W[fb];B[qg];W[rg];B[if];W[ig];B[eh];W[ka]
;B[bk];W[bl];B[ck];W[ak];B[aj];W[al];B[ej];W[fj];B[om];W[bj]
;B[cj];W[ai];B[hn];W[gg];B[ef];W[ge];B[jf];W[rn];B[rm];W[fr]
;B[bs];W[gr];B[iq];W[hr];B[ir];W[is];B[js];W[hs];B[sn];W[ro]
;B[ng];W[jr];B[oq];W[or];B[jq];W[mq];B[kr];W[ms];B[fq];W[dr]
;B[ls];W[ns];B[eq];W[ds];B[er];W[es];B[ac];W[ab];B[ad];W[bb]
;B[bh];W[mp];B[mo];W[ri];B[lm];W[sj];B[sk];W[rk];B[si];W[qj]
;B[qk];W[sj];B[hq];W[sl];B[fs];W[sm];B[rl];W[so];B[mk];W[pi]
;B[oi];W[qi];B[pk];W[oh];B[oj];W[pg];B[nh];W[qh];B[mi];W[ll]
;B[lj];W[kj];B[mj];W[lh];B[ml];W[dk];B[dj];W[co];B[bo];W[ek]
;B[hf];W[gf];B[hg];W[hh];B[jc];W[fh];B[kb];W[la];B[ja];W[ma]
;B[oc];W[ob];B[fm];W[gm];B[fn];W[he];B[en];W[dm];B[og];W[oo]
;B[no];W[pf];B[fg];W[cd];B[ae];W[kg];B[dg];W[mg];B[lf];W[mh]
;B[ff];W[oe];B[nf];W[ne];B[mf];W[me];B[md];W[pe];B[mc];W[kf]
;B[ke];W[id];B[je];W[ga];B[ha];W[ic];B[fa];W[ib];B[jb];W[ia]
;B[fl];W[fk];B[km];W[jm];B[im];W[jl];B[hm];W[ah];B[hl];W[hk]
;B[pn];W[bg];B[af];W[ch];B[dh];W[bi];B[ei];W[cg];B[bf];W[ag]
;B[mb];W[na];B[lp];W[lr];B[pa];W[pb];B[mr];W[ps];B[lr];W[de]
;B[df];W[ep];B[ee];W[ed];B[ph];W[fp];B[gp];W[an];B[ao];W[am]
;B[oh];W[ie];B[on];W[cs];B[br];W[lb];B[fo];W[cm];B[em];W[fe]
;B[eo];W[bm];B[aq];W[gk];B[gn];W[tt];B[tt])

Allan Crossman