Author: Uri Blass
Date: 02:08:02 06/10/05
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On June 10, 2005 at 03:50:08, Rémi Coulom wrote: >On June 09, 2005 at 23:59:48, Daniel Shawul wrote: > >>Bxe4 is the suggested best move at this position. >>My engine can't find it even after a very long time. >>Is it a zugzwang problem? >>[D]8/3p4/p1bk3p/Pp6/1Kp1PpPp/2P2P1P/2P5/5B2 b - - >>where can i find complete analysis of these positions? >>Daniel > >It is not a zugzwang problem, but a sacrifice with long-term compensation: after >sacrificing the bishop, the opponent's bishop cannot prevent the pawn to pass. > >I believe that, much more than zugzwang, sacrifices with long term compensation >are a big problem for the null move in the endgame. I have special heuristics in >the Crazy Bishop to limit the use of null move in endgame positions where the >opponent has dangerous passed pawns. > >Rémi I think that the question if it is zugzwang may be dependent on the evaluation. Movei has no problem because it does not use null move when the number of legal moves of the opponent is small. After 1...Bxe4 2.fxe4 f3 3.e5+ Kd5 White has no good move but it has only 7 legal moves(not enough even to consider using null move pruning in Movei) If white is allowed to wait then I see no easy win for black and a possible line is 1...Bxe4 2.fxe4 f3 3.e5+ Kd5 4.Null d6(Ke4 or Kxe5 also leads to queen endgame) 5.exd6 Kxd6 6.Null Kd5 7.Null Ke4 8.Kc5 Ke3 9.Kb6 Kf2 10.Kxa6 Kxf1 11.Kxb5 f2 12.a6 Kg1 13.a7 f1Q 14.a8Q Uri
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