Author: Ed Schröder
Date: 00:14:20 03/05/98
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>Posted by Howard Exner on March 04, 1998 at 22:17:53: >8/6p1/6k1/p7/2p5/r6P/P1RK2P1/8 w - - id"Fritz 5.0 - Rebel 9.0" >This is a game from Kai Luebke's 40/2 tournament run on two P200's. >Here Fritz played Rxc4 and the game continued with Rxa2+ Rc2, Rxc2. >Of course this entire sequence for white is a terrible blunder. Could >some of the programmers explain what is going on here. Are these >positions still too difficult for computers when they are so simple for >humans? Or is knowledge code required to solve these positions? Fritz >being a deep searcher misses this so I'm guessing some sort of >endgame knowledge is needed. Any explanations for Fritz's choice? Don't know about Fritz but since Rebel8 this kind of situations is fixed (should read as improved) using special extensions. You will notice using Rebel9 (I didn't check Rebel8) that after 1.Rxc4?? Rxa2+ Rebel9 will not play 2.Rc2?? but 2.Ke3 to avoid the lost pawn ending. Rebel9 sees the lost pawn ending after the rook exchange not because of 100% chess knowledge but still by search. Unfortunately it is very complicated to program the pawn endgame due to hundreds of exceptions to the rules you have to consider in the code. So the easy way out is chosen and that's by using the search. - Ed -
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