Polish Opening: Schiffler-Sokolsky Variation
ECO A00
Move order
1. b4 e6 2. Bb2 Nf6 3. b5 d5 4. e3
Ideas
ECO A covers irregular and flank openings—systems that skip the main e4/d4 fight early. White gains queenside space immediately—the Sokolsky / Polish family. 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.