[Pachi] death in gote : eyeshape dictionary & chainstatus

Petr Baudis pasky at ucw.cz
Thu Jul 21 14:07:34 CEST 2011


  Hi!

On Tue, Jun 14, 2011 at 12:38:48PM +0100, jonathan chetwynd wrote:
> major concerns with pachi are life + death and liberties, 
> 
> (;B[po];W[cc];B[dd];W[cd];B[de];W[jq];B[bf];W[ce];B[cf];W[qg];B[db];W[dc];B[ec];W[cb];B[fb];W[df];B[ch];W[ef];B[fe];W[lc];B[ff];W[cl];B[co];W[gq];B[eq];W[nk];B[pk];W[fg];B[eg];W[oc];B[lq];W[eh];B[dg];W[qi];B[qj];W[pm];B[pi];W[oo];B[op];W[rm];B[om];W[pn];B[on];W[no];B[pl];W[ol];B[nm];W[qo];B[pp];W[mm];B[nl];W[ml];B[ok];W[qp];B[qq];W[np];B[nq];W[nn];B[ol];W[rq];B[pq];W[rj];B[ri];W[lo];B[rr];W[rp];B[kp];W[mq];B[mr];W[mk];B[rk];W[mp];B[or];W[dp];B[eo];W[do];B[dn];W[en];B[cq];W[gg];B[dm];W[ep];B[fp];W[fo];B[dq];W[fq];B[rn];W[cp];B[bp];W[gp];B[bn];W[em];B[el];W[dl];B[fl];W[dj];B[gm];W[ig];B[jm];W[jo];B[ko];W[kn];B[jn];W[kq];B[jp];W[ip];B[io];W[lp];B[jo];W[lr];B[jj];W[hn];B[ik];W[gj];B[fj];W[dh];B[ee];W[fi];B[gk];W[hj];B[ej];W[hk];B[hl];W[ek];B[fk];W[ci];B[dk];W[ck];B[ei];W[di];B[gi];W[hi];B[fh];W[il];B[im];W[hm];B[jl];W[cm];B[cn];W[bj];B[bh];W[ki];B[bi];W[ek];B[bm];W[gn];B[dk];W[ji];B[cj];W[ph];B[qh];W[oi];B[pg];W[qd];B[oh];W[sn];B[sq];W[sr];B[qr];W[be];B[ab];W[eb];B[ea];W[og];B[qf];W[rg];B[rf];W[bq];B[br];W[ic];B[rl];W[qn];B[ro];W[ms];B[nr];W[pf];B[ph];W[gb];B[ad];W[sf];B[rh];W[ae];B[ca];W[er];B[ds];W[qe];B[sg];W[aq];B[dr];W[gc];B[ld];W[ba];B[da];W[ac];B[bc];W[bb])
> 
> pachi plays white, see last move, for death in gote.
> does pachi have an eyeshape dictionary?
> this is a basic and well known example.

  Pachi has some eyeshape-related heuristics that were developed
recently, but we have not found effective ways to use them yet. Adding
knowledge to Monte Carlo simulations usefully is fairly tricky.

> this game also has a capture race,
> see move 132 re chainstatus.

  Yes, this is a problem essentially all my real research work revolves
around. :-)

-- 
				Petr "Pasky" Baudis
UNIX is user friendly, it's just picky about who its friends are.


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