Author: Uri Blass
Date: 00:35:23 02/18/06
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On February 17, 2006 at 20:03:41, William Penn wrote: >I won't try to give examples here, but my impression is like Vincent's. I >regularly compare long analysis from Fruit and Rybka in infinite mode (usually >several hours run time) and their evaluations are remarkably similar, in >general. I haven't noticed any major exceptions. But that's just my impression, >I haven't researched or quantified it. >WP My impression is different based on analysis of correspondence games. I clearly see cases of disagreement and it is not that one is always right. difference of more than 0.5 pawns is significant difference and there were cases when I saw it in practical analysis. The position that I gave is not from my correspondence games but from analysis of one of my tournament games when rybka understand immediatly that black is better and fruit see score that is close to draw (even at depth 3 that is probably depth 5 of other programs because i do not believe vasik's information about depth). I think that if you try unbalanced positions when one side has passed pawns and the other side has material compensation then you can see often significant difference between fruit and rybka and unbalanced positions happen. In one case there was no significant difference in evaluation but there was a significant difference in the suggested move and I believe that rybka's move was simply better. It is important to choose the better move when the evaluation of many moves is almost the same. Uri
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