Author: Andrew Williams
Date: 02:29:33 08/03/99
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On August 02, 1999 at 21:57:03, James Robertson wrote: >On August 02, 1999 at 10:41:55, Andrew Williams wrote: > >>On August 01, 1999 at 21:02:54, Scott Gasch wrote: >> >>>Ouch... >>> >>>I only can search to 4 ply in that position in 60 sec and my null move succeeds >>>about 40% of the time. I believe this bad performance has sometime to do with >>>my qeval routine and the fact that it considers all captures/promotes. I think >>>I need to be more selective about captures in the qeval routine. My program >>>plays f2f3 after 1 minute of thought. Here's the report (if anyone cares): >>> >>> total nodes.....................................4588297 >>> time (sec)......................................60.71 >>> rate (nodes/sec)................................75579 >>> >>Your program is nearly twice as fast as mine! But I think you're right >>about selectivity in qsearch. This is a lot of nodes for 4 ply. You might >>look carefully at your move ordering as well. >> >> >>> null move successes.............................73 >>> null move failures..............................117 >>> null move success rate..........................38.42% >>> >> >>Are these the actual figures? If so, I think there is a problem. Why do >>you only try null move 190 times out of 4.5 million nodes? In my program >>it tries null move so long two conditions are satisfied: (a) both sides >>must have at least two Pieces and (b) the last move wasn't a null move. >>In this case, it tries null move in about 70% of non-quiesce nodes. If >>this figure (190) is correct, I think you could be using null move a lot >>more. > >I'll add c) side to move not in check. > >James Oops! Forgot about that one. Andrew > >> >> >>> pawn hash hits..................................4469147 >>> pawn hash misses................................117413 >>> pawn hash success rate..........................97.44% >> >>There's clearly nothing wrong with your pawn hash table! :-) I get a 92% >>hit rate here. >> >>Regards, >> >>Andrew
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