Sicilian Defense: Wing Gambit, Marienbad Variation
ECO B20
Move order
1. e4 c5 2. b4 cxb4 3. a3 d5 4. exd5 Qxd5 5. Bb2
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.