Author: blass uri
Date: 03:57:11 06/12/00
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On June 12, 2000 at 05:46:59, Rémi Coulom wrote: >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 black can promote first with check so white can never promote. Uri
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