Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, San Francisco Gambit
ECO B30
Move order
1. e4 c5 2. Nf3 Nc6 3. Bb5 Na5 4. b4
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.