Author: Michel Langeveld
Date: 10:47:51 03/15/04
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On March 15, 2004 at 13:28:41, Dan Honeycutt wrote: >I presently include the king in my pawn hash but i question if i'm getting my >money's worth. all I do are (1) look at shelter the abc or fgh pawns provide >the castled king and (2) see if king supports passed pawns. without the king >the pawn hash hit rate is 98 to 99 percent. with the king it drops to about 93 >percent. my gut feel is I should either do more with the king or remove him >altogether. > >What are others doing? Is hashing the king worthwhile? > >Thanks >Dan H I had first in Nullmover pawnhashtable without a king. Since a few days it has a king in the hash and also castling rights. It was for me around 5% faster. I had already in my pawnhash: * pawn structure (double pawns, groups rule) * pawn center evaluation I added exta (because of the king in the hashtable) * shield in front of the king and other wings when not castled * Since I have piecelists I added also the Piece Square Table entries of a pawn I have plans to add: * weak pawns * passer pawns And since I write this I release that I can also add the Piece Square Table of the king!!
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