[Pachi] self-play

Vlad Dumitrescu vladdu55 at gmail.com
Fri Aug 5 12:37:17 CEST 2011


More details, "undetermined result" means that the players disagreed
on the exact result but not on who won.

Is Pachi's score evaluation non-deterministic? How can two instances
of it disagree about the score of a game?

I'm including an example.

(;AP[gomill:?]
C[Event: pachi
Game id AvB_0019
Date 2011-08-05 12:30
Result pv vs p8 ? (players disagreed)
pv cpu time: 1.62s
p8 cpu time: 1.53s
Black pv Pachi UCT Engine:8.00 (Shuhaku): I'm playing UCT. When I'm
losing, I will resign, if I think I win, I play until you pass. Anyone
can send me 'winrate' in private chat to get my assessment of the
position.
White p8 Pachi UCT Engine:8.00 (Shuhaku): I'm playing UCT. When I'm
losing, I will resign, if I think I win, I play until you pass. Anyone
can send me 'winrate' in private chat to get my assessment of the
position.]
CA[utf-8]DT[2011-08-05]EV[pachi]FF[4]GM[1]GN[pachi AvB_0019]KM[7.5]
PB[Pachi UCT Engine:8.00 (Shuhaku): I'm playing UCT.]
PW[Pachi UCT Engine:8.00 (Shuhaku): I'm playing UCT.]RE[?]SZ[9];B[fc];W[eg]
;B[fh];W[bf];B[gf];W[cb];B[cf];W[eb];B[gb];W[fg];B[gd];W[bc];B[gh];W[bh];B[dh]
;W[dd];B[eh];W[dg];B[cg];W[ce];B[hf];W[hg];B[ch];W[hc];B[ec];W[bg];B[cc];W[dc]
;B[ed];W[df];B[ee];W[hd];B[de];W[hb];B[ga];W[he];B[fi];W[ff];B[fe];W[ha];B[bd]
;W[cd];B[ie];W[gc];B[gg];W[fb];B[if];W[fa];B[tt];W[tt]
C[pv vs p8 ? (players disagreed)
pv final_score: B+4.5
p8 final_score: W+12.5]
)

regards,
Vlad

On Fri, Aug 5, 2011 at 10:54, Vlad Dumitrescu <vladdu55 at gmail.com> wrote:
> Hi all,
>
> I have started actually doing something constructive with my
> computer-go interest :-) and at the moment just setting up the
> environment. I use gomill to run games and when I use pachi (8.0) to
> play with itself, I get many games where the players disagree with the
> result. There are also many games with undetermined result, whatever
> that means.
>
> Is there some configuration that I should have been using, or
> something? I just used the command-line from the README
> ./pachi -t =1000 policy=ucb1,playout=light,prior=eqex=0,dynkomi=none
>
> best regards,
> Vlad
>


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