Author: James Robertson
Date: 18:57:03 08/02/99
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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 > > >> 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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