Author: blass uri
Date: 00:00:03 08/01/00
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On August 01, 2000 at 02:48:18, Poschmann wrote: >On July 31, 2000 at 02:25:37, Poschmann wrote: > >>In a magazine I found the following position. It should be a draw ? >>Unfortunately I don't have the following issue of the magazine with the >>solution. >>It is a 6-piece-endgame. I tried to solve it with the help of Fritz6 >>(without tablebases), but I can't. >> >>[D]K7/8/4k3/1R1R4/8/8/p7/7r w - - >> >>I had the following to ideas: >>a) Go to a 5-piece-endgame: >>1. Re5+ Kf6 2. Rf5+ Kg6 3. Rg5+ Kh6 4. Rh5+ Rxh5 5. Rb6+ Kg5 6. Ra6 Rh2 >> >>b) Allow Black to promote the pawn: >>... 4. Rge5 a1=Q+ 5. Ra5 >> >>I think in both cases White loses the game. But I can't proof it without >>tablebases. >>- Can somebody with the 5-piece-tablebases proof position a) >>- Are some 6-piece-tablebases available to proof position b) without a pawn or >> the initial position with one pawn. >>- Is there somebody who knows the initial position and its solution ? >> >>Thank you >>Ralf Poschmann > >Thank you all ! >At first I was very surprised about the very different lines of the computer >(crafty + tablebases) and the human. But then it become quite clear. If both >lines come to a draw, the computer selects its best. It depends on the number >of plies until the draw or if equal on the sorting order of its moves or >tablebase entries in memory. >But a human player thinks completely different. _NO_ tournament player will make >1. ... Kd6 because this draw is seen immediately. _EVERY_ black player will try >to win the position with Kf6 because the position is not so clear. >If the computer should play more human like, the programmer needs an algorithmic >expression for the different situations after the two moves Kd6 / Kf6. This >expression will increase the practical difficulties of his human counterpart. >Ralf Poschmann The next version of crafty will not play moves like Kd6. I suggested Bob Hyatt to evaluate tablebases draws as +0.01 for the side with the material advantage and not as 0.00 Bob Hyatt replied that it is a good idea and that this idea will be used in the next version of Crafty. Uri
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