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Chess Opening Database

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Example Searches: Queens gambit, B33, d4 d5

> ECO Openings Starting With This Line: 1

Catalan diagram

Catalan (E09)

Closed, Sokolsky variation

1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Nbd2 b6 9. b3 a5 10. Bb2 Ba6