Author: Robert Hyatt
Date: 20:37:05 01/12/98
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On January 12, 1998 at 17:08:01, James B. Shearer wrote: >On January 11, 1998 at 10:45:20, Robert Hyatt wrote: > >>On January 11, 1998 at 08:51:06, Carsten Kossendey wrote: >> >>>On January 11, 1998 at 01:07:46, Stuart Cracraft wrote: >>> >>>>Someone on this newsgroup wrote about a useful extension >>>>that went something like "If the null move search returns >>>>a mate score, e.g. n moves to mate, then extend." >>> >>>If you use recursive null moves, you will want to limit it to small N's >>>since otherwise you start extending lines where your opponent moves 6 >>>times in a row or something, and even the most quiet positions look like >>>mates then ;) >>> >> >>I do recursive null-move, but *never* two null-moves back to back, so >>that >>this isn't a problem. > > But two nulls moves in a row by the same side are not considered >back to back are they? So this is not really to the point. However 6 >moves in a row by the same player means a search depth of 21 (6 plys >for the moves, 15 (3*5) plys for the 5 null moves) so this should not >be a big problem. > James B. Shearer Oops.. I misread... but the above could easily be limited in that if a threat extension is done at N, it could be disallowed at N+2, much like when I do a null at N, I don't allow it at N+1... I'll put this on my list to test some later..
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