Author: Andrew Williams
Date: 14:22:24 03/07/04
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On March 07, 2004 at 17:05:53, Uri Blass wrote: >On March 07, 2004 at 16:46:28, Andrew Williams wrote: > >>On March 07, 2004 at 10:24:47, Jon Dart wrote: >> >>>I ran a 40 move/40 minute match between Postmodernist 1.010a and Arasan 7.4. >>>Hardware was an XP2500+, 64 MB Hash for Arasan, 44MB for PM. Arasan lost this >>>match, +3, -10, =7. Games are available at >>> >>>http://www.arasanchess.org/pm.pgn >>> >>>I haven't analyzed the games in detail. My general impression was that PM gained >>>greater mobility in several games and was able to win "positionally". For >>>example, in game 4, PM got doubled rooks and had the better position for most of >>>the game, but really won in the endgame where it was able to out-manouver Arasan >>>and win material. >>> >>>Game 18 looks like an opening book problem (18 .. Ne8 is the standard move, but >>>isn't in Arasan's small book). >>> >>>--Jon >> >>Hi Jon, >> >>Thanks for this report. Speaking of book issues, I have been experimenting with >>an improved "preferred" book for PostModernist. I have essentially got rid of >>the lines which I had been adding because I think PM has done Ok with them at >>ICC. Instead I have been inserting "bog-standard" lines. All this was done on >>Peter Berger's advice. The results have been *ASTONISHING*. For example, the >>current match score is: >> >>improvedpreferred 108.5 - 61.5 standardpreferred >> >>The previous match score was 158 - 119 standardpreferred before I stopped it. >> >>I would NEVER have imagined a result like it, and it has been VERY easy to do >>this. >> >>Andrew > >I do not understand what was so easy in changing the book. > >What exactly did you change? My preferred book is a series of lines like this: e4!! c5 Nf3!! d6 d4!! cxd4 Nxd4!! Nf6 Nc3!! a6 Be3!! I used to have various odd lines in there - mostly as a result of looking through PM's performance on ICC and deciding based on that which openings it was "comfortable" with and which ones it wasn't well suited to. Peter Berger was kind enough to point out that the book was actually worse than useless. >What is bog-standard lines? "Bog-standard" means normal. Essentially, I've gone through a large collection of games (Dann's huge one, using just games where both players are > 2550 or something like that) and (generally) selected the moves which are most often played in openings. Andrew
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