Author: Bruce Moreland
Date: 16:55:42 08/22/99
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On August 22, 1999 at 07:14:16, Marc Plum wrote: >But of course, as you know, the ending KNN vs KP is frequently a theoretical >win. The idea is to let the pawn run at just the right moment. Without the >pawn the king gets stalemated, but with it there can be that extra tempo to use >for checkmate(just as in your game). The most important factor is how far the >pawn has already advanced. The position after Black's 77th move in your game >would seem to be one of the winnable positions. It matches the criteria given >in the 1987 edition of the USCF rules of chess, which defined the conditions for >extending the 50 move rule to 100 moves for certain endings. According to this, >the position can be won against an h pawn provided it is securely blocked by a >knight and no farther advanced than h5. > >Aren't there tablebases for this available? If someone has these on his >computer, then how many moves until mate in the following cases? First, if >Black had played 74 ... Nh4 to block the pawn immediately, and only then Kxe3. >Second, after Black's actual move 74 . . . Kxe3?!, If 75 h4! Nd4+ 76 K moves Nf5 >77h5 Nh6, how many moves until mate then? 75. h4 is the best move after 74 ... Kxe3, but white is mated on move 159, as black to move mates in 85 with 75. ... Nd4!, the only move to win. Assuming 76. Kb1 Nf5! is the only move to win. bruce
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