Author: Simon Finn
Date: 03:34:27 10/30/01
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On October 29, 2001 at 10:46:55, Robert Hyatt wrote: >EvaluateWinner() is designed to catch positions like KRB vs KRPP. The KRB >has no chance of winning. KRPP _can_ win. EvaluateWinner() returns a >result that indicates that which tells the Search to avoid such positions >with the KRB and accept them (if the pawns are advanced enough) for the KRPP >side. > >In KRB vs KRPP the score will _never_ be positive. It will either be zero, >if the pawns are not advanced very far, or less than zero if the black pawns >are getting advanced enough to be a problem. > >But _never_ greater than zero since white has no chances. That's not literally true. It's true in normal positions, but how can you decide if a position is "normal" without search? KRB is mating material, and the mates can be quite deep. For example: [D]5rk1/5p1p/7K/6B1/8/7R1/8/8 w - - 0 1 bm Bf6 After 1. Bf6 Rc8 2. Rg3+ Kf8 3. Kxh7 Ke8 4. Re3 White wins by bringing his king to b7. I'm sure there are plenty of other examples. Simon
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