Author: Bruce Moreland
Date: 09:32:03 06/29/00
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On June 29, 2000 at 11:17:20, blass uri wrote: >I understand that you say that chess programs have different hash signature for >the position after 1.Nf3 Nf6 2.d4 and the position after 1.d4 Nf6 2.Nf3 because >they assume in the first position that the d4 may be captured next move. These two positions are not the same: 1) In the first case, the last move made was a pawn move, which reset the 50-move counter, leading to a game that is potentially one move longer than in the second case. 2) The position after 1. d4 Nf6 has occurred in the second game but not in the first game, so if this position is repeated twice more, the game can be declared drawn in the second case but not the first case. These are trivial objections, but depending upon what someone does with the unique position count data, they may be important. bruce
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