Author: Laurence Chen
Date: 16:51:05 05/01/00
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On May 01, 2000 at 18:09:03, KarinsDad wrote: >On May 01, 2000 at 16:26:25, Laurence Chen wrote: > >>On May 01, 2000 at 01:54:30, Ernst Walet wrote: >> >>>On April 30, 2000 at 10:46:55, Harald Faber wrote: >>> >>>>This position is a nice test of endgame knowledge for programs: >>>> >>>>Which program(s) avoid 1.Bxh7?? g5+!! 2.hxg6+ Kg7 3.Rg8+ Kh6 and draw, white has >>>>no chance to enter the black fortress. >>>> >>>>[D]7R/5kpp/8/7P/4BK2/8/8/3r4 w - - am Be4h7;bm Kf4e5 Kf4g3;id >>>>Sax-Kovacevic,Sarajewo 1982; >>> >>>This is what Fritz6a analyses overnight after making the moves above. >>> >>>[D]6R1/7B/6Pk/8/5K2/8/8/3r4 w - - 0 1 >>> >>>Still it sees a win for white. Can you line out how the draw is achieved? >>> >>>Ernst. >>>snip >>Easy question to answer, just remove the White pawn from the above position, and >>the Tablebases (5 men) will give a score of 0.00. If White cannot win by >>removing the pawn, it clearly shows that all Black has to do is to prevent the >>pawn from promoting, and give perpetual check.... Easy draw... :) >>Laurence > > >Yes, but are you sure that all positions that are 5 man TBs as draws cannot be >won with an additional pawn for the side with more material? > >A program could not "drop the pawn" and be assured of a draw in any given >position. Hence, how do you code such a position? > >KarinsDad :) I'm sorry KarinsDad, I was trying to answer the post about how would one figure out if it was a draw. The best way to figure out a plan is to "dream up" of a position, and try to work from the actual position to get to the dream position. This is quite easily done for human players to dream up of positions. By removing the pawn it shows that White's extra material is not sufficient to win. Therefore it must try to somehow exchange rooks in order to win. Laurence
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