Author: Dieter Buerssner
Date: 08:29:51 01/02/04
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On January 02, 2004 at 09:05:05, Gareth McCaughan wrote: >On January 01, 2004 at 14:00:52, Dieter Buerssner wrote: > >> The idea of Roland: When "I" have a Q as only piece, and my K and pawns have no >> moves, I cannot win. > >Could you expand on that a little? As it stands, the criterion >you just described is met by the position 8/8/8/8/8/7k/8/6QK >which is certainly not drawn :-). You are of course right. But a one ply search will be enough, to see, that this is won, even when the above rule is used. OTOH, for the position discussed at the start of the thread, a very long search will be needed, to see a draw (or in other cases, to find the only drawing move). The idea cannot be used for pruning as shown by your example. But supported by search, it should work rather reliably (meaning no draw score in won positions and finding draw for the class of positions it was designed for). Two other positions (both were discussed in this forum, I think): Behting 1906: [D] 8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - 0 1 bm Kc6; Chekhover, 1952: (this is PET 12) [D] 8/8/8/5Bp1/7k/8/4pPKP/8 w - - bm Bg4; Bg4 e1Q h3 I don't think, the idea has much (or any) practical relevance for games. Regards, Dieter
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