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Re: [Bug-gnubg] Strange rollout result ?
From: |
Neil Robins |
Subject: |
Re: [Bug-gnubg] Strange rollout result ? |
Date: |
Mon, 18 May 2009 12:03:45 -0700 (PDT) |
I think this is the sort of result you often get in situations where a player
is hit after bearing some checkers off. 2-ply frequently seems to massively
over-estimate that players chances and take huge passes.
Massimiliano Maini wrote:
>
> Hi all,
>
> this looks odd to me:
>
> GNU Backgammon Position ID: cP8BAJBtGwCwBQ
> Match ID : cAlgAXAACAAA
> +13-14-15-16-17-18------19-20-21-22-23-24-+ O: gnubg
> | | O | O O X X X | O 7 points
> | | | O O X X | O
> | | | O O |
> | | | O |
> | | | 9 |
> v| |BAR| | 11 point match (Cube: 1)
> | | | |
> | | | |
> | | | |
> | | | X X X X X | On roll
> | | | X X X X X | 1 point
> +12-11-10--9--8--7-------6--5--4--3--2--1-+ X: xxx
>
>
> Rollout details:
> Centered 1-cube:
> 0.8109 0.0000 0.0000 - 0.1891 0.0571 0.0050 CL +0.5695 CF +1.1167
> [0.0019 0.0000 0.0000 - 0.0019 0.0014 0.0010 CL 0.0043 CF 0.0100]
> Player gnubg owns 2-cube:
> 0.8194 0.0000 0.0000 - 0.1806 0.0566 0.0071 CL +1.1630 CF +1.1385
> [0.0018 0.0000 0.0000 - 0.0018 0.0015 0.0014 CL 0.0086 CF 0.0100]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 858145082 and
> quasi-random dice
> Play: 2-ply cubeful prune [world class]
> keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
> Skip pruning for 1-ply moves.
> Cube: 2-ply cubeful prune [world class]
>
> In MWC:
>
> Rollout details:
> Centered 1-cube:
> 0.8109 0.0000 0.0000 - 0.1891 0.0571 0.0050 CL 19.082% CF 21.356%
> [0.0019 0.0000 0.0000 - 0.0019 0.0014 0.0010 CL 0.018% CF 0.041%]
> Player gnubg owns 2-cube:
> 0.8194 0.0000 0.0000 - 0.1806 0.0566 0.0071 CL 21.548% CF 21.446%
> [0.0018 0.0000 0.0000 - 0.0018 0.0015 0.0014 CL 0.036% CF 0.042%]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 858145082 and
> quasi-random dice
> Play: 2-ply cubeful prune [world class]
> keep the first 0 0-ply moves and up to 12 more moves within equity 0.16
> Skip pruning for 1-ply moves.
> Cube: 2-ply cubeful prune [world class]
>
>
> First, with ND at +1.1167 and D/T at 1.1385, gnubg indicates D/P as
> the right decision, while it should be ND/P (too good).
>
> Second, there are no gammons for X, how can it be too good ?
> Is gnubg taking cobes that are in fact passes later on ?
>
> By the way, the copy button in the hint window/analysis panel does not
> copy all the information (it misses the recap with the equities and
> differences dor the 3 actions ND, D/T, D/P and the final decision).
>
> MaX.
>
> P.S.
> I have a sgf file with the match and the rollout saved.
>
> _______________________________________________
> Bug-gnubg mailing list
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> http://lists.gnu.org/mailman/listinfo/bug-gnubg
>
>
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