Author: Tony Werten
Date: 08:09:55 04/14/04
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On April 14, 2004 at 10:03:04, Alvaro Jose Povoa Cardoso wrote: >Hi, >I've been playing with the following history heurist variant: >Along with the PieceType-From-To formulation I added 8 bits that correspond to >the rightmost 8 bits of the hashkey. >So the new index to the history table is as follows: >HashKey-PieceType-From-To >HashKey is only 8 bits as said before. The idea is to try to match as much as >possible the moves that failed high with the 'true' posições where that happened >since in the classic hitory heuristic aproach we have little or nothing that >says that those history moves found at the current node where previously stored >in the exact same position as the current one. In other words history moves >don't mean they came from the same position. It is exactly this I'm trying to >avoid. >However when I tryed this idea it failed miserably with much higher node counts. >My question is why did this failed? Others have explained. >Is this a wrong idea from the very beginning? I don't think so. If only you could get the characteristics of the position (or the move) in these 8 bits. Tony > >Best regards, >Alvaro Cardoso
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