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Subject: Re: Rybka - not an endgame expert

Author: Uri Blass

Date: 05:51:29 12/05/05

Go up one level in this thread

On December 05, 2005 at 08:34:26, Gabor Szots wrote:

>Just two examples. Positions taken from from PET.
>
>
>8/5k2/4p3/4Pp1p/5P1P/3Rn2K/6p1/8 b - - bm g1=B;                id "PET026: rook
>vs knight";
>
>Here Rybka plays g1Q, although it does see it is only draw.
>
>
>8/8/1P1k2p1/8/5P1p/4Qb2/1q4PK/8 w - - bm Qe5+;                 id "PET046: Q+B
>vs Q";
>
>Rybka captures at f3.
>
>
>Both positions are easily solved by most of the engines. Position No26 usually
>in 0 seconds.

It seems that Rybka does not consider underpromotions

[D]8/3P1k2/2q5/8/8/6Pb/7P/6K1 w - - 0 1

New game,
8/3P1k2/2q5/8/8/6Pb/7P/6K1 w - - 0 1

Analysis by Rybka 1.0 Beta 32-bit:

1.Kf2 Qc2+
  -+  (-17.90)   Depth: 3   00:00:00
1.Kf2 Qc2+
  -+  (-17.95)   Depth: 4   00:00:00
1.Kf2 Qc2+
  -+  (-320.00)   Depth: 5   00:00:00

(,  05.12.2005)

In the second position it is really strange that rybka cannot solve it in a
short time and I guess that there is a bug.

Uri

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