Re: [gnugo-devel] reading connections

[Gunnar Farneback]

Allan Crossman wrote:
> Hmm, well this particular one isn't that egregious (!) in terms of points,
>   but it seems like GnuGo makes some sort of fundamental mistake...

Without doing any real analysis, my guess is that this has to do with
the move valuation not doing sufficient distinction between moves
working with or without ko.

Dan wrote:
> Here's a game that was played on NNGS. I've commented the game
> though I haven't tried to make a test based on it yet. There are
> a lot more bad mistakes here than just the moves I've commented.

Let me counter with another NNGS game. This was a nine stone game
against a strong player, juka 1d*. There are certainly lots of
mistakes to fix, but what's really interesting is what happens in the
upper right corner towards the end of the game. Please take a look at
the sequence following black T12 at move 242. I'm impressed.

/Gunnar

(;GM[1]FF[4]
SZ[19]HA[9]KM[0.5]
PW[juka]WR[1d*]
PB[GnuGo (GNU Go 3.1.8)]BR[14k*]
PC[NNGS]DT[2001-10-09]AP[gnugoclient:2.0]
RE[W+40.5]
AB[dd][jd][pd][dj][jj][pj][dp][jp][pp]
;W[fc];B[fd];W[gd];B[fe];W[ec];B[dc];W[ic];B[df];W[pg];B[nd]C[L:8]
;W[ld];B[lc]C[L:9];W[kc];B[jc];W[mc];B[lb]C[L:7];W[md];B[nc]C[L:6]
;W[mb];B[of]C[L:7];W[og];B[kb]C[L:8];W[ib];B[id]C[L:7];W[hd];B[kd]
C[L:8];W[mf];B[if]C[L:6];W[hf];B[ig]C[L:7];W[hg];B[dh]C[L:8];W[ih]
;B[kg]C[L:9];W[jh];B[mg]C[L:8];W[nf];B[ng]C[L:6];W[oe];B[pf]C[L:4]
;W[pe];B[pc]C[L:2];W[oi];B[qf];W[qe];B[qg];W[qh];B[rh];W[qi];B[rg]
;W[re];B[ph]C[L:3];W[oh];B[pi];W[qb];B[qj];W[lh];B[lg]C[L:4];W[mi]
;B[ne]C[L:5];W[me];B[nb]C[L:4];W[na];B[la]C[L:5];W[ma];B[kh]C[L:6]
;W[ki];B[le]C[L:7];W[oa];B[he]C[L:6];W[ge];B[jb];W[ie];B[lf]C[L:3]
;W[pb];B[oj];W[ni];B[hh]C[L:4];W[je];B[ke];W[jg];B[ja];W[fq];B[fp]
;W[gp];B[fo];W[eq];B[dq]C[L:5];W[cl];B[dn]C[L:4];W[el];B[bm]C[L:2]
;W[go];B[ji]C[L:3];W[mk];B[nl]C[L:4];W[on];B[ml]C[L:5];W[lk];B[kl]
;W[kk];B[jk]C[L:6];W[ll];B[lm]C[L:4];W[jl];B[pm]C[L:2];W[km];B[np]
C[L:3];W[qo];B[rn];W[qp];B[qq];W[qn];B[qm]C[L:2];W[pq];B[oq]C[L:0]
;W[pr];B[rq]C[L:1];W[ln];B[kq]C[L:2];W[mq];B[mp]C[L:1];W[or];B[nr]
C[L:0];W[nq];B[mr];W[op];B[no]C[L:1];W[lq];B[po];W[pn];B[oo];W[nn]
;B[lp]C[L:2];W[lr];B[mn]C[L:0];W[mm];B[iq];W[hr];B[kr];W[ms];B[io]
;W[gm];B[qr];W[rs];B[ps];W[qs];B[sp];W[rm];B[rl];W[ro];B[sm]C[L:1]
;W[so];B[mo]C[L:2];W[nm];B[hp]C[L:3];W[hq];B[ko]C[L:4];W[lo];B[oq]
C[L:5];W[ns];B[jn]C[L:6];W[ho];B[kn]C[L:7];W[lm];B[gh]C[L:8];W[jr]
;B[gk]C[L:3];W[ej];B[bj]C[L:4];W[eh];B[ii]C[L:5];W[jf];B[fg]C[L:6]
;W[cm];B[cn]C[L:7];W[bl];B[ei];W[ci];B[di]C[L:5];W[bn];B[ch]C[L:6]
;W[bo];B[ia]C[L:7];W[gb];B[fj]C[L:8];W[ol];B[nk];W[pl];B[eb]C[L:9]
;W[ql];B[hb]C[L:10];W[hc];B[ha];W[fb];B[db];W[ff];B[rk];W[ef];B[ee]
;W[eg];B[gg]C[L:8];W[gf];B[hl];W[hm];B[im]C[L:7];W[il];B[hj]C[L:6]
;W[ek];B[nj]C[L:7];W[ik];B[kj]C[L:8];W[li];B[bk]C[L:9];W[ck];B[bi]
C[L:7];W[cj];B[ir];W[is];B[rf];W[sf];B[dg]C[L:8];W[gl];B[hk]C[L:6]
;W[fh];B[fi]C[L:4];W[ak];B[fk]C[L:5];W[fl];B[ed]C[L:6];W[ea];B[fa]
C[L:7];W[ga];B[da]C[L:8];W[aj];B[bh]C[L:7];W[sg];B[ri];W[dk];B[ai]
;W[al];B[sh]C[L:8];W[se];B[rc]C[L:9];W[rb];B[rd]C[L:10];W[sc];B[ob]
;W[pa];B[sd];W[sb];B[ra];W[om];B[rm];W[ij];B[fa];W[gc];B[ea];W[lj]
;B[hi];W[];B[er];W[fr];B[bq]C[L:5];W[cr];B[dr]C[L:6];W[aq];B[br]
;W[bs];B[qk];W[jm];B[mj]C[L:7];W[in];B[sn]C[L:8];W[pk];B[ap]C[L:9]
;W[bp];B[cq]C[L:6];W[cs];B[nh]C[L:7];W[];B[mh]C[L:8];W[];B[ok]C[L:9]
;W[];B[kf]C[L:10];W[];B[]
C[R15 removed
R18 removed
B7 removed
D6 removed
D4 removed
A4 removed
F4 removed
L5 removed
K4 removed
L3 removed
M4 removed
J5 removed
H4 removed
J3 removed
P3 removed
R3 removed
T4 removed
Q1 removed
final_score: W+40.5]
)