Author: Daniel Clausen
Date: 13:37:57 06/08/01
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Hi On June 08, 2001 at 16:23:39, Robert Hyatt wrote: >On June 08, 2001 at 16:21:01, Robert Hyatt wrote: > >>On June 08, 2001 at 16:08:52, John Merlino wrote: >> >>>On June 08, 2001 at 15:19:09, Robert Hyatt wrote: >>> >>>>Here is a cute position that occurred between a commercial program and Crafty >>>>last week: >>>> >>>>[D] 8/p4pp1/3rk2p/4p3/2P5/2K4P/P2R1PP1/8 w - - 0 1 >>>> >>>>Crafty was black and moved the rook to d6, offering a trade. The opponent >>>>took it and was happy to do so. Unfortunately, white is lost. White saw >>>>the passed pawn and apparently was quite happy. Crafty's static evaluation >>>>for this position is -1.0 roughly. >>>> >>>>For those that "don't do endgames" black's king-side majority is the problem >>>>here. White's passer gets blockaded, white has to desert it to stop black's >>>>kingside passer he makes after a few pawn moves, and then black eats white's >>>>a pawn and promotes. >>>> >>>>Instructional, at least. These are the kinds of positions you want to >>>>see your program get right. I saw a very similar one against a GM today, >>>>playing Crafty. He calculated for a long time after crafty offered to trade >>>>the last piece on the board. He traded, and 10 moves later realized he was >>>>dead lost. :) >>> >>>How did this game end after the rooks were traded? >>> >>>jm >> >> >>Black wins easily. > > >I should have added, the point here is that white ends up in a king and pawn >ending with a passed pawn to none for black. Black has a kingside majority that >many programs ignore. Here it is decisive. I'm not a good chess player but trying to summarize. Please correct me if I'm wrong. Black can easily transform the pawn majority on the kingside into a passer. After that White and Black both have a passer but Black wins because his (or her, or its :) passer is farer (is that an English word?) away than white's. Basically a program (or a human) has to recognize that in this situation the pawn majority for black on the kingside is worth a passer. Does this sound about right? Regards, Sargon
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