Author: Johanes Suhardjo
Date: 19:56:56 12/27/03
To answer that question, I take gm2600.pgn, separate it into whiteall.pgn
where white wins and blackall.pgn where black wins.
For whiteall.pgn, I run through the games. For every game, when white has
won material for 3 moves, I print out the fen of the position 5 moves earlier
(thus 2 moves before white wins material). The output is whitewins.fen.
For blackall.pgn, I do the same thing and come up with blackwins.fen.
I don't know what I can figure out of whitewins.fen and blackwins.fen, but
some of you might find them useful. You might be able to extract some
information for piece square table, pawn structure, space control, etc.
Or you might be able to tune your evaluation parameters.
Of course, this information is not accurate. Among the flaws I can think
of are:
1. Some games are won when the winning side has less material. But,
that's probably more search than evaluation issue.
2. The positions I print out may not be the critical positions.
3. The losing side might have just blunders the games (although not
highly likely with grandmasters rated higher than 2600 ELO points).
The games are in http://www.nd.edu/~johanes/whiteall.pgn.bz2 and
http://www.nd.edu/~johanes/blackall.pgn.bz2. The "winning" positions
are in http://www.nd.edu/~johanes/whitewins.fen and
http://www.nd.edu/~johanes/blackwins.fen.
Hope that's useful.
PS. The extra two numbers at the end of the fen lines are the game and move
numbers where the position occurs.
Johanes Suhardjo
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