Author: Michael Yee
Date: 07:40:06 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? >Is this a wrong idea from the very beginning? > >Best regards, >Alvaro Cardoso I like your idea (essentially to give an extra bonus to history table moves from "similar" positions)... But using some bits from the hash key (assuming you're using a zobrist scheme) wouldn't work since they're designed to vary a lot even between very similar positions. Michael
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