Author: Miguel A. Ballicora
Date: 08:10:30 02/28/01
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On February 28, 2001 at 05:56:36, Leen Ammeraal wrote: >I am not sure about when to avoid nullmoves. >I omit it: >a. when in check >b. when there are less than 5 pieces (including pawns) on the board >c. when the last move was a nullmove >d. at the root node >Should I also omit it in some other cases, >for example, when any hashmove (even with a low draft) was found, >or when beta = alpha + 1? >Thanks in advance for any help. >Leen Hi Leen, Regarding b, I do not know whether what I am doing now is correct but I think that works for me: When either black or white had no "long range" pieces (bishop, rook or queen) I disable null move. The rationale is that one side cannot waste a tempo in a given position having pawns, king and/or knights making the position prone to have a zugswang. Miguel
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