Author: Uri Blass
Date: 01:24:46 11/27/00
Go up one level in this thread
On November 27, 2000 at 02:01:37, Mike S. wrote:
>I have found another example. I don't think that many programs will play Rxf5+
>here, although they cannot be called really stupid in this case... but the
>solution looks easy - if you know it, as usual:
>
>[D]8/2p5/p1P1p3/P3kb2/1P4pp/8/5R2/7K w - -
>
>[Event "CSS 4/99 (Bednorz/Thiele)"]
>[Site "?"]
>[Date "1879.01.01"]
>[Round "?"]
>[White "Solovtsov"]
>[Black "(study)"]
>[Result "1-0"]
>[SetUp "1"]
>[FEN "8/2p5/p1P1p3/P3kb2/1P4pp/8/5R2/7K w - -"]
>
>1. Rxf5+ exf5 2. b5 Kd6 3. bxa6 Kxc6 4. Kh2 f4 5. Kg1
>{A human player may see in the diagram position already,
>that the 3 black pawns can't harm white's king now, and are
>going to be captured due to zugzwang. After that, black's
>king has to move and the a-pawn can promote.} 1-0
>
>Regards,
>M.Scheidl
Most programs will not find Rxf5+ but Crafty17.13 plays Rxf5+ in 0 seconds with
0.00 evaluation.
It seems that crafty has a wrong evaluation and is simply luvky.
[D]8/2p5/P1k5/P4p2/6pp/8/8/7K w - - 0 1
Crafty evaluates this position as 0.00 at depth 1 and it does not see like other
programs that black has more pawns.
Testing Crafty shows that Crafty is simply lucky because it also evaluate the
position without the c7 pawn at depth 1 as a draw
[D]8/8/P1k5/P4p2/6pp/8/7K/8 b - - 0 1
This position is clearly a win for black but Crafty says 0.00 at small depthes.
Uri
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