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ECO A23

ECO A00–A99 — Flank openings: 1.c4, 1.Nf3, 1.f4 and other first moves, plus early Indian and Benoni systems.

1 named opening lines are classified under ECO code A23.

English Opening: King's English Variation, Two Knights Variation, Keres Variation — 1.c4 e5 2.Nc3 Nf6 3.g3 c6