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RE: [Bug-gnubg] RE:Why is odd ply equity always lower?
From: |
Ian Shaw |
Subject: |
RE: [Bug-gnubg] RE:Why is odd ply equity always lower? |
Date: |
Tue, 10 Jun 2003 17:33:29 +0100 |
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden Behalf Of Joern
> Thyssen
> Sent: 10 June 2003 13:32
> To: GNU Backgammon Bugs
> Subject: Re: [Bug-gnubg] RE:Why is odd ply equity always lower?
>
>
> On Tue, Jun 10, 2003 at 01:11:52PM +0100, Ian Shaw wrote
> >
> > Since a 1-ply eval is just 21 0-ply evals, it appears that GnuBg is
> > consistently overvaluing the equity for the side on roll.
>
> Not necessarily. gnubg may just be overestimating one side.
> For example,
> it may overestimate the side playing against a holding game. The 1-ply
> evaluation is averages of equities for the player having the
> high-anchor, so it's not symmetric unless it's a mutual holding game.
>
> For any of your positions, try with the opponent on roll, and
> calculate
> the 0-ply, 1-ply, 2-ply, etc. equities. If they exhibit the
> same pattern
> then you may have a point.
>
> Jørn
>
I've just tried 7 assorted but common positions (money games), changing only
who is on roll, and haven't found any evidence to support the theory.
5 point holding game bLuBAQO6eQ4GAA 1 & 3 ply consistently think roller's
position is better than 0 & two ply do.
55 blitz after 54 4PPgQUAzTvABMA 1 & 3 ply consistently think
roller's position is better than 0 & two ply do.
100 - 96 pip race 2N1tAADY9m4AAA No pattern.
90 - 132 race YNvdAQC4uzsAAA No pattern.
Full prime vs 2-point 2N0NABhsdzcAAA No pattern.
4 point holding game Nnc3AADY3Q0ABg Racer's position improves until 3-ply.
Mutual Holding game sN2GAQOY3YYBBg 3-ply most pessimistic, 4-ply most
optimistic
--Ian
- [Bug-gnubg] RE:Why is odd ply equity always lower?, Michaeldepreli, 2003/06/10
- RE: [Bug-gnubg] RE:Why is odd ply equity always lower?, Ian Shaw, 2003/06/10
- RE: [Bug-gnubg] RE:Why is odd ply equity always lower?,
Ian Shaw <=
- RE: [Bug-gnubg] RE:Why is odd ply equity always lower?, Ian Shaw, 2003/06/12
- RE: [Bug-gnubg] RE:Why is odd ply equity always lower?, Nis, 2003/06/12
- Re: [Bug-gnubg] RE:Why is odd ply equity always lower?, Joseph Heled, 2003/06/12
- Re: [Bug-gnubg] RE:Why is odd ply equity always lower?, Nis Jorgensen, 2003/06/12
- Re: [Bug-gnubg] RE:Why is odd ply equity always lower?, Joseph Heled, 2003/06/12
- Re: [Bug-gnubg] RE:Why is odd ply equity always lower?, Joern Thyssen, 2003/06/13
- Re: [Bug-gnubg] RE:Why is odd ply equity always lower?, Nardy Pillards, 2003/06/13
- RE: [Bug-gnubg] Why is odd ply equity always lower?, Nis, 2003/06/18
- Re: [Bug-gnubg] Why is odd ply equity always lower?, Joern Thyssen, 2003/06/19
- Re: [Bug-gnubg] Why is odd ply equity always lower?, Nis, 2003/06/19