Author: Uri Blass
Date: 14:31:26 03/07/04
Go up one level in this thread
On March 07, 2004 at 17:22:24, Andrew Williams wrote: >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 I do not see it as easy to generate bog-standard book. I first need to write a program to read a file of pgn games and find for every position the most often played line and I also think that the most often played lines may be bad because it is possible that a line was played often in 1990-2000 and was refuted in 2001 but you still have a lot of games from 1990-2000 when the line was played. Statistics about wins may be also misleading because the refutation may be based on a single game when before the refutation you can get many wins for the wrong side. Uri
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