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Re: [Bug-gnubg] Dropped by move filter
From: |
Christian Anthon |
Subject: |
Re: [Bug-gnubg] Dropped by move filter |
Date: |
Wed, 25 Jun 2008 11:21:19 +0200 |
I agree,
this is a position where 2ply is expected to do much better, even
cubeless, since it understands the variation tree much better.
It sounds like a good idea though, to make a collection of
moves/evals/cubes where 0ply is way of compared to 2ply or rollouts.
Christian.
On Wed, Jun 25, 2008 at 12:00 AM, Robert-Jan Veldhuizen
<address@hidden> wrote:
>
>
> On Tue, Jun 24, 2008 at 11:32 AM, Achim Mueller <address@hidden> wrote:
>
>> The point is not a technical bug but the fact that gnubg totally
>> misevaluates a position at 0ply that actually should be handled easily.
>> I put some more positions at http://www.acepoint.de/index.php?id=37. This
>> section will be extended from time to time.
>> Another idea is to open a section at www.gnubg.org that can be filled by
>> readers and users also.
>>
>
> Actually this one is not so easy I think. A quick 0/2-ply rollout suggests
> that this is a heavily cube-influenced checker play:
>
> 1. Rollout 21/15 8/4 Eq.: +0,431
> 61,3% 7,5% 0,4% - 38,7% 3,4% 0,1% CL +0,283 CF +0,431
> [ 0,1% 0,1% 0,1% - 0,1% 0,1% 0,0% CL 0,003 CF 0,007]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 826408977 and
> quasi-random dice
> Play: 0-ply cubeful prune [expert]
> Cube: 2-ply cubeful prune [world class]
> 2. Rollout 21/11 Eq.: +0,393 ( -0,037)
> 60,6% 5,7% 0,4% - 39,4% 4,8% 0,1% CL +0,230 CF +0,393
> [ 0,1% 0,1% 0,1% - 0,1% 0,1% 0,0% CL 0,003 CF 0,008]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 826408977 and
> quasi-random dice
> Play: 0-ply cubeful prune [expert]
> Cube: 2-ply cubeful prune [world class]
> 3. Rollout 21/17*/11 Eq.: +0,365 ( -0,066)
> 64,1% 11,7% 0,4% - 35,9% 12,2% 0,2% CL +0,293 CF +0,365
> [ 0,1% 0,1% 0,0% - 0,1% 0,1% 0,0% CL 0,003 CF 0,007]
> Full cubeful rollout with var.redn.
> 1296 games, Mersenne Twister dice gen. with seed 826408977 and
> quasi-random dice
> Play: 0-ply cubeful prune [expert]
> Cube: 2-ply cubeful prune [world class]
>
> As you can see, the #3 play, gnubg 0-ply's favourite, still has the highest
> cubeless equity. It's not surprising that without a lookahead, gnubg fails
> to see the future cube implications here.
>
> I guess what's going on, is that a hit leads to overkill after a dance and
> subsequent cube. So, cubeful, you don't reap full benefits of this play when
> it works. The alternative play 21/15 8/4 is less volatile and supposedly
> leads to more efficient cube usage (after a miss).
>
> Greetings,
> --
> Robert-Jan Veldhuizen