Author: Mike S.
Date: 23:41:02 01/28/06
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On January 29, 2006 at 02:03:44, Mike Byrne wrote: >Rybka actually sees that Kxa2 merely draws and the winning move is Kb2 .... > >FEN: [d]8/3R1P2/1ppP1p2/3r4/8/K7/p4k2/8 w - - 0 1 This is a delightful test position! :-) Because, it is easy for a human to understand why Kxa2 ends in a draw. The wK is in a cage in the bottom-left quarter of the board, where he cannot escape Black's rook checks. It seems to be a very good "am" avoid move test. What is the source (a study I assume)? I tried it with my F8 version (FfF4) and H9 on P4/3.0 GHz, which would both play Kxa2? and did not see the draw, after ~3 minutes and comparable depths of 17 or 18. Then, I tried the 1st Rybka beta for comparison... Analysis by Rybka 1.0 Beta 32-bit (P4/3.0 GHz, 128 MB hash): 1.Kxa2 f5 2.Ra7 Re5 3.f8Q Re2+ 4.Kb3 Re3+ 5.Kc4 Re4+ +- (3.52) Depth: 3 00:00:00 = (0.00) Depth: 17 00:00:41 7855kN 1.Kb2 Ra5 2.Ka1 Ra8 3.Re7 Rh8 4.Kxa2 Ra8+ 5.Kb3 Rf8 +- (8.31) Depth: 17 00:01:53 21251kN +- (8.31) Depth: 17 00:01:53 21251kN So, in this position there was no endgame weakness to spot. :) (With the only little exception that Rybka 1.0 Beta didn't seem to be able to finish the 18th ply and/or create any new output here anymore, after 10+ minutes...?) Regards, M.Scheidl
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