GrandPQ.pgn is a prequel to Grand07.pgn, and it covers the years 1981 thorugh 1998.
It contains 117K long time-control human-human games. Minimum elo rating is 2300.
Filtered out were blitz, rapid, duplicates, games of 25 moves or less, Internet, Correspondence, Simultantaneous, Exhibition and Blindfold games. Errors were fixed. Suitable for use in making a neutral opening book. 20M download.
It can be downloaded from a link at Jim Ablett's "Winboard Chess Projects":
http://homepages.tesco.net/henry.ablett/jims.html
-Norm