Author: Mig Greengard
Date: 01:43:26 10/18/02
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I know this is the CCC and not a CC, but we already know that engines don't find a win or the best defense because their evaluation of several of the endgames is completely wrong. In what you post white has many chances to simply capture on b5, giving up a rook for the black knight and b-pawn for a dead drawn rook vs queen fortress position. The engines will never do this because they think the queen vs rook position is wonderful for black, with evals of +4 or higher. But this is the simplest draw of the many possible. The only variations of interest are those than can refute these defensive concepts: 1. Giving up a rook for knight and pawn for a fortress. 2. Giving up both rooks for queen and pawn for a drawn f+g pawns vs N+h-pawn endgame. 3. Giving up a rook for both b-pawns for a drawn R vs R+N endgame. Number three is the only one that seems to offer any chances for a black win right now. But several GMs have looked at that ending in detail and have had no success in winning it. According to Keene, he played an almost identical ending with Mednis over three days (adjournments) and never won it. There may exist some fantastical lines with an attack on the white king using the b-pawn as bait, or other possibilities with the queen still on the board, but this seems unlikely at this point. Saludos, Mig
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