Author: Bryan Hofmann
Date: 03:55:36 04/06/04
Go up one level in this thread
On April 06, 2004 at 00:28:50, Brian Katz wrote:
>Would someone be kind enough to mention what the differences between 19.12 and
>19.11 are?
>
>Thanks
>
>Brian Katz
19.12 fix to allocating split blocks that did not let all blocks get
used, which would produce slow-downs on large parallel boxes
(cpus > 8-16). change to fail-high/fail-low window adjustment.
I now use the old Cray Blitz approach ("Using time wisely -
revisited", JICCA) where a fail-high (or low) now adjusts the
root alpha or beta bound by 1 pawn on the first fail, another two
pawns on the second failure, and finally relaxes the bound to
+/- infinity on the third fail for the same move. this speeds up
searching many fail-high/fail-low conditions, although it will
occasionally cause the search to take a bit longer.
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