Looking for a few thousand opposite-castling PGNs

[Tom Likens]

I'm looking to tune my opposite castling eval code and I'm wondering if anyone has a collection of either
FEN, EPD or PGN files of opposite castling positions and/or games that they'd be willing to share. I've been
looking around but haven't really found anything. I'm not sure if this can be done with a chess database,
(probably) but I don't have access to one right now.

Anyway, thanks in advance.

regards,
--tom

[AlvaroBegue]

You can download almost a half million games in PGN format from CCRL 40/40 and almost another million from CCRL 40/4:

http://computerchess.org.uk/ccrl/4040/games.html
http://computerchess.org.uk/ccrl/404/games.html

You can then find games that contain both O-O and O-O-O. You could hack a Perl script to do that.

[jdart]

I extracted about 7500 such games from ChessBase (using the "Manoeuvers" filter) and put them here:

http://www.arasanchess.org/oppcastle.zip

--Jon

[Adam Hair]

Here are 7809 engine vs engine games (long time control, 2700+ Elo) in which opposite side castling occurred:

http://www.mediafire.com/?118qc4eb7o2xy8y

[Tom Likens]

NT