Author: Robert Hyatt
Date: 19:01:20 12/18/99
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On December 18, 1999 at 19:21:13, Tom Kerrigan wrote: >On December 18, 1999 at 09:15:26, Robert Hyatt wrote: >>This has already been done. To prevent the oscillation you mention. You can >>simply 'fudge' up the score for the first move, and adjust alpha/beta to match, >>or you can leave the score for the first move alone, but search all remaining >>moves with score+N, score+N+1. I tried it many years ago, but didn't like it. >>If you believe your eval, then you believe that +.05 is worth something... > >It seems like you could save a LOT of time doing this in some positions... that >isn't worth it? Do you have some statistics? >-Tom No statistics, just observations. We played a bunch of games using Cray Blitz on a VAX vs various (at the time) commercial chess machines like the supercon and so forth. shifting the window does make the search go faster, and it helped in those positions where you are oscillating between two developing moves like Nf3 and Nc3 (for example). But in middlegame/endgame positions, I often found myself wishing (after playing over a game with the shift turned off) that it had played the move that was only slightly better score-wise... Null-move already effects scores at the root enough...
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