CI DiamondBase. Instant download.
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E12 Queen's Indian Defense, Petrosian Variation 4.a3.
955 annotated games and variations, mostly by players themselves.
CI System of Signs.
No format barriers. You are getting: PGN+CBH+CA files, readable by ChessBase, Chess Asistant, CI Expert Lite (free) or any PGN reader.
1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. a3...
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