Sicilian Defense: McDonnell Attack, Toilet Variation
ECO B21
Move order
1. e4 c5 2. f4 d5 3. Nc3
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. The variation is defined by a short, recognizable move order. Use the diagram and SAN list to recognize the tabiya, then try the line against Maia to explore typical plans in practice.