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Example Searches: Queens gambit, B33, d4 d5
> ECO Openings Starting With This Line: 3
> Continuation: O-O (2)
Four knights (C48)
Spanish, Classical defense
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5
Marshall variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nd4
Bardeleben variation
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bc5 5. O-O O-O 6. Nxe5 Nxe5 7. d4 Bd6 8. f4 Nc6 9. e5 Bb4