Author: Uri Blass
Date: 00:04:21 12/20/05
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On December 20, 2005 at 00:01:55, Mike Byrne wrote: >I had noticed that Rybka is very tough for me even at sd==1 (a level where I can >usally can hold my own. Yes There are 2 possibilities 1)Rybka searches to depth that is more than 1 at depth 1. 2)Rybka's evaluation detects a lot of tactical material including a fork in the next ply Here is an example [D]3Nk3/4pppp/8/8/4r1q1/8/3PPPP1/3KQ1R1 b - - 0 1 Every program that I know except rybka beta is going to play Kxd8 at depth 1. The fork by f3 is too deep for them to see it. Rybka prefers Rb4 at depth 1 I have doubt if it see the fork or see another the threat to win the queen so I composed another position [D]3Nk3/2pppppp/1p6/p7/P3r1q1/1P6/2PPPPP1/3KQ1R1 b - - 0 1 Here rybka prefers Rd4 at depth 1. It may be extensions or it may be that the evaluation ask question like can the opponent do fork next ply. If this is evaluation then it is very smart evaluation because the evaluation can see that the fork does not work because of check after it in the following position when Rybka plays Kxd8 at depth 1. [D]3Nk3/2pppppp/1p6/p7/P3r1q1/1P6/2PPPPP1/3QK1R1 b - - 0 1 Uri
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