Polish Opening: King's Indian Variation, Sokolsky Attack
ECO A00
Move order
1. b4 Nf6 2. Bb2 g6 3. c4 Bg7 4. e3 d6 5. Nf3 O-O 6. d4
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.