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Subject: Re: Database update available

Author: Andreas Stabel

Date: 08:54:58 04/13/05

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On April 12, 2005 at 10:09:10, Norm Pollock wrote:

>An update to my pgn database is available at Peter Skinner's crafty-chess.com
>site. The zip file is quite large (44M, so a broadband connection is
>recommended.) This database (normbk03.pgn) has 199,375 games of master level
>(2300+ elo) players, played 1991-2005.
>
>Only long time control human v human games. Removed include twins/duplicates,
>rapid, blitz, blindfold, simultaneous, and Internet games. Also games with
>defective tags and fen tags were removed. Games of 20 moves (40 plies) or less
>were removed. All games have results and both elo values. Also removed are
>variations, comments, and nags.
>
>The games are "clean" and "unique". They were played from 1991 to the present.
>
>To download, go to crafty-chess.com (run by Peter Skinner),
>downloads, Pollock, then pick normbk03.zip.
>
>Direct link:
>
>http://www.crafty-chess.com/down/Pollock/normbk03.zip

Thanks a lot !
Here is some statistics:
Read 199375 games with 17109129 moves, 3913029 lines, 142755702 bytes !
Got max. 391 moves in game 142113 before line 2792526 !
Got 538937712 legal moves in 17308504 positons !
Got max. 72 legal moves after move 38 in game 63568 line 1248586 !

Total move statistics:
Pawn moves = 4485089, Knight moves = 3024703, Bishop moves = 2671281
Rook moves = 3306896, Queen moves = 2054892, King moves = 1923888
Check moves = 848511, Mate moves = 1534, Stalemate moves = 207
Hit moves = 3454825, En passant moves = 13547, Pawn two moves = 1196348
Short castlings = 320116, Long castlings = 37504
Promotion to queen = 10762, Promotion to rook = 82
Promotion to bishop = 23, Promotion to knight = 185

Total game statistics:
White won = 74132, Drawn = 74154, Black won = 51089
Unknown result = 0, Illegal result = 0, Conflicting results = 0
White mated = 658, White stalemated = 107
Black mated = 876, Black stalemated = 100

My program reports the following possible errors:
*** Warning: Result=1 differs from real result = white mated in line 140768 !
*** Warning: Result=3 differs from real result = black mated in line 587712 !
*** Warning: Result=1 differs from real result = white mated in line 1191830 !
*** Warning: Result=2 differs from real result = white mated in line 1213532 !
*** Warning: Result=1 differs from real result = white mated in line 1229653 !
*** Warning: Result=2 differs from real result = white mated in line 1865661 !

Result=1 = Black win, Result=2 = Draw, Result=3 = White win

Best regards
Andreas



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