Alekhine Defense: O'Sullivan Gambit

1.
1. e4
2. Nf6
2.
3. e5
4. Nd5
3.
5. d4
6. b5

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The Alekhine Defense: O'Sullivan Gambit is a chess opening classified under ECO code B03 (Semi-Open games). It is a variation of the Alekhine Defense family. Step through the moves on the board above, then play the line yourself or review it with the built-in engine.