ECO B03

Alekhine Defense: O'Sullivan Gambit

Alekhine Defense: O'Sullivan Gambit is a chess opening classified under ECO B03. Its defining line here is 1. e4 Nf6 2. e5 Nd5 3. d4 b5.

Alekhine Defense: O'Sullivan Gambit — board position♜♞♝♛♚♝♜♟♟♟♟♟♟♟♟♞♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜

1. e4 Nf6 2. e5 Nd5 3. d4 b5

Explore this opening ▸Add to my repertoireOpen in analysis

The diagram shows the position after 1. e4 Nf6 2. e5 Nd5 3. d4 b5. Play through it move by move in the interactive explorer.

Opening name, ECO code, and main line come from the Lichess open chess openings dataset.

Part of