Alekhine Defense: Four Pawns Attack
ECO B03
Move order
1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. c4 Nb6 5. f4
Ideas
ECO B covers semi-open games after 1. e4 where Black does not reply …e5. White stakes a claim in the center and opens lines for the bishop and queen. This entry tracks a longer branch in the opening tree. Use the diagram and SAN list to recognize the tabiya, then try the line against Maia to explore typical plans in practice.