But I haven't used them extensively, and I don't know how they compare or if any of them (or any other leading game collections) have quality problems, such as containing duplicate games. I have a little bit of experience with the game collections at, (I like their feature of being able to find games where both players are above a specified rating), and. (Overall size of the collection doesn't matter I'm not interested in seeing below-master games, so just the master-level ones matter to me.) I don't mind paying a bit for access if that's required. I'm writing an opening book, and for my research, I want access to a large database of master-level games.
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