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ECO A20

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

5 named opening lines are classified under ECO code A20.

English Opening: Drill Variation — 1.c4 e5 2.g3 h5
English Opening: King's English Variation — 1.c4 e5
English Opening: King's English Variation, Kahiko-Hula Gambit — 1.c4 e5 2.e3 Nf6 3.f4 exf4 4.Nf3
English Opening: King's English Variation, Nimzowitsch Variation — 1.c4 e5 2.Nf3
English Opening: King's English Variation, Nimzowitsch-Flohr Variation — 1.c4 e5 2.Nf3 e4