Author: Robert Hyatt
Date: 06:26:05 01/13/04
Go up one level in this thread
On January 12, 2004 at 18:51:22, Uri Blass wrote: >On January 12, 2004 at 17:47:07, Robert Hyatt wrote: > >>On January 12, 2004 at 17:34:52, Uri Blass wrote: >> >>>I do not see when it happens in crafty and note that it is not only a question >>>of speed when it is not clear what is faster and if I understand correctly >>>crafty may be wrong when a sequence of captures that is finished in trading >>>kings happens and it may happen in the endgames. >>> >>>[D]8/5r2/5k2/3R1p2/5K2/8/8/8 w - - 0 1 >>> >>>Rxf5+ is a good capture but based on SEE that let trading kings it can be >>>pruned. >>> >>>Uri >> >>No. It is not very frequent and doing the test will burn more time than >>avoiding the test saves, since the occurrence is so tiny. I simply ignore >>it totally... > >I am not sure about the speed part. > >Doing the test is only adding one if > >I guess that it saves time in every case that capturing the king is done and not >only in cases of trading kings because you do not need to search for captures >after capturing the king. > >Uri one if is not free. If you do it a billion times, in ordering a billion moves, it is even less free. This is the way to take a program from 2M nps to 1M nps in a heartbeat. Just add a few nanoseconds here, and a few there, and before you know it... :)
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