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Subject: Re: Unstable aspiration search

Author: Daniel Clausen

Date: 13:18:53 02/11/03

Go up one level in this thread


>window=pawn_unit:
>
>1	-1	0	1		1.a3
>1	14	1	5		1.d3
>1	23	1	14		1.d4
>1	105	1	21		1.Nc3
>2	-103	1	52		1.Nc3 Nf3
>2	0	2	96		1.Nf3 Nf6


>window=pawn_unit/10:
>
>1	-1	0	1		1.a3
>1	14	1	5		1.d3
>1	23	1	14		1.d4
>1	105	1	21		1.Nc3
>2	-103	2	52		1.Nc3 Nf3
>2	0	2	96		1.Nf3 Nf6


>window=pawn_unit/100: (pawn_unit=1000)
>
>
>1	-1	0	1		1.a3
>1	14	0	5		1.d3
>1	23	0	14		1.d4
>1	105	1	21		1.Nc3
>2	-206	1	49		1.Nc3 Nf3
>2	0	1	93		1.Nf3 Nf6


It seems to me that you either have a flaw when displaying the current PV or
some major bug in your search. (I think it's the first one only)

Each time, the first PV for ply=2 contains an illegal last move. The errors only
occurs on even plies though.

Since the search has just started and I assume the HT was empty, it can't really
be a collision-problem in the HT. But something's definitely wrong there. Since
the error occurs already after a few searched nodes, it should be rather easy to
find this one, no? (I assume it's reproducable?)

There are errors on higher (even) plies too, but I'm sure they have the same
source. Hope you find this pesky bug soon! :)

Sargon



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