Author: Ed Schröder
Date: 14:55:36 12/26/02
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On December 26, 2002 at 15:47:35, Vincent Diepeveen wrote: >On December 26, 2002 at 14:58:51, Ed Schröder wrote: > >>Merry Christmas to all CCC members in the first place! >> >>As you know I have retired from chess programming, after 22 years enough is >>enough. Right now I am documenting my work, part of it will be a description of >>the main parts of REBEL in the hope some others will benefit from it. >> >>The main page can be found on: >> >>http://members.home.nl/matador/chess.htm >> >>The programmer stuff on: >> >>http://members.home.nl/matador/chess840.htm > >Thanks for your excellent contribution to computerchess Ed. > >It's a very great thing to do. > >You describe a mate killer move giving a 3-4% speedup. I was amazed >by this statement. Around 1996 Bart Weststrate described this mate killermove >to me too. I then tried it in DIEP. Indeed it speeded DIEP up bigtime at >testsets. Some positions it searched plies deeper in fact. However after >a few weeks i saw diep struggling to get another ply in games. In game positions >the where there was not a mate trick to find and some stupid >line went into a mate once, then being saved to the mate killer table; >(and usually you do not get into a position where the opponent is getting >mated soon) there DIEP suffered *bigtime* from this special killertable >i had. Yep, as usual move ordering relates to the other stuff you have. >So i threw it out. > >Note that i indexed it a bit different than you do, but that won't change the >picture at all. > >The 3-4% speedup you claim here, is that based upon tactical testsets? A mixed testset, positional, tactical, endgame, about 750 positions. Ed >Best regards, >Vincent > >>So far only move-ordering is finished but I am planning to have the rest of the >>issues ready at least end of next month. >> >>My best, >> >>Ed
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