Re: [gnugo-devel] new testcase

[Evan Berggren Daniel]

On Wed, 9 Oct 2002 address@hidden wrote:

>
> > This looks like a very interesting problem, and I'm not really sure of the
> > correct answer.  However, it looks like gnugo made a mistake somewhere.
> >
> > loadsgf games/nngs/evand-gnugo-3.3.9-200210080559.sgf 124
> > gg_genmove black
> > #? [1 S14]
> >
> > Thanks
>
> What happens if B plays S14 is hard to say. Here's one variation,
> showing B trying to kill the corner and losing the semeai. But
> the position is complex. There might be a way to get more liberties
> and win but W has a *lot* of liberties.
>
> On the other hand, if B just plays Q14, capturing one stone in a
> ladder, W makes life and B gets sente. This seems just fine, especially
> since B already killed a group on the left side.

OK, thanks.  In that case, the test should probably be an owl test,
because gnugo thinks the white group is either dead or critical (with
black to play) up until move 123.  I think that gnugo should either be
trying to kill it, or wall it in in sente from the beginning, not change
its mind in the middle.  Then again, I could be wrong.

Thanks again

Evan Daniel

>
> Dan
>
> (;GM[1]FF[3]
> SZ[19]HA[2]KM[0.5]
> PW[evand]
> WR[13k*]
> PB[GnuGo (GNU Go 3.3.9)]
> BR[11k*]PC[NNGS]
> DT[2002-10-08]
> AP[gnugoclient:2.0]
> RE[B+40.5]
> AB[pd][dp];W[qp];B[dd];W[nq];B[qh];W[jd];B[lc];W[fc];B[df];W[db];B[cc]
> ;W[jb];B[cj];W[cn];B[fq];W[bp];B[cq];W[bk];B[qk];W[jq];B[bq];W[co];
> B[qn];W[ff];B[oh];W[me];B[dh];W[fh];B[cb];W[ec];B[mh];W[lg];B[ki];
> W[nn];B[nd];W[nf];B[pf];W[qc];B[qd];W[pc];B[ii];W[ig];B[mj];W[rd];
> B[re];W[rc];B[lm];W[kn];B[nm];W[on];B[hr];W[ir];B[bj];W[ck];B[om];
> W[pn];B[pm];W[hq];B[ak];W[al];B[aj];W[bl];B[fo];W[dj];B[dk];W[ei];
> B[dl];W[cl];B[dm];W[cm];B[ap];W[bo];B[en];W[an];B[bm];W[di];B[bh];
> W[ci];B[bi];W[ch];B[cg];W[qo];B[rn];W[hn];B[ob];W[pb];B[oc];W[oa];
> B[ik];W[fj];B[ln];W[lo];B[ko];W[jo];B[kp];W[lp];B[kq];W[mn];B[gr];
> W[jp];B[jn];W[km];B[kr];W[jm];B[ll];W[mm];B[kl];W[jl];B[jk];W[in];
> B[ml];W[oe];B[ne];W[of];B[od];W[mg];B[sd];W[rb];B[qa];W[pa];B[sc];
> W[sb];B[ra];W[qe]
> (;B[pe];W[se];B[rf];W[sd];B[ro];W[rp];B[sp];W[sq];B[so];W[rr];B[da];
> W[ea];B[ca];W[md];B[mc];W[lh];B[ng];W[li];B[mi];W[kj];B[ji];W[lj];
> B[kk];W[kc];B[og];W[mf];B[ld];W[le];B[jg];W[jf];B[ih];W[hg];B[sf];
> W[kg];B[gm];W[hl];B[hk];W[gl];B[eg];W[fg];B[gn];W[go];B[gp];W[ho];
> B[fl];W[gk];B[gi];W[fi];B[ek];W[fk];B[lb];W[hm];B[fm];W[jh];B[na];
> W[kb];B[dc];W[ed];B[eb];W[fb];B[ee];W[fe];B[fa];W[ga];B[ea];W[hb];
> B[ef];W[eh];B[dg];W[ce];B[bf];W[dn];B[gq];W[hp];B[kh];W[jg];B[kd];
> W[ke];B[ka];W[ja];B[la];W[lk];B[mk];W[hj];B[hi];W[ij];B[jj];W[gj];
> B[hs];W[is];B[gh];W[gg];B[il];W[im];B[ej];W[ao];B[aq];W[do];B[mr];
> W[nr];B[ks];W[ms];B[lr];W[mq];B[hh];W[tt];B[tt]
> C[final_score: B+40.5
> R19 removed
> C15 removed
> R15 removed
> B9 removed
> L5 removed])
> (;B[rf];W[se]
> (;B[sd];W[pe];B[nb];W[lb];B[na];W[md];B[mc];W[mb];B[kc];W[kb];B[sa];
> W[qb];B[ra];W[ma];B[nc];W[jc])
> (;B[pe];W[sd]C[
> ])
> )
>
> )
>
>
> _______________________________________________
> gnugo-devel mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/gnugo-devel
>