Author: Rémi Coulom
Date: 02:46:59 06/12/00
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On June 10, 2000 at 13:44:35, blass uri wrote: >On June 10, 2000 at 11:54:17, Ed Schröder wrote: > [...] >> >>Maybe the opposite is true. It depends per program how the programmer >>looks at things. For this position I would say that having 2 outside >>passers usually is a great advantage and as such is rewarded by a chess >>program. If so then this position is an exception to the rule. And the >>end-game is full of exceptions much more than the mid-game. >> >>Ed > >Having 2 outsides passed pawns is an advantage but having 2 advanced passed pawn >is also an advantage. > >The problem is to know which advantage is bigger. > >I agree that it is not a simple problem and I understand the fact that >programmers prefer to waste more time about other problems. > >I still believe that it is possible to see it at evaluation time by an array >64*64*64 of distance to promotion. You are perfectly right about this idea. I do it in TCB. I have a table for distance to promotion for KPK and PPK. In fact, it is not really a table of distance to promotion, but a table that gives the maximum number of "not a King move by the opponent" before the pawn is promoted. I call it "extended square of the King". It is not in the latest version of TCB. I will make it available in the next version. If programmers are interested in the code to generate the table, I will send it to them. PPK is nice, but KPK is probably much more useful. TCB can solve WAC #100 in 25 seconds or so on a celeron 400 thanks to it. It saves 3 or 4 plies as compared to the standard "square of the Pawn" rule (or is it "square of the King"?). It is also very good at detecting that a pawn can win a tempo by checking the opponent on its way to promotion. I do not think it would solve this position though. I am not a good chess player, but the position after the Queen exchange seems unclear to me. Black can promote first, but White will promote on the next half move. Is it a winning advantage? Or I might be missing something. I will try it on TCB when I am back home. Greetings, Remi
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