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ECO A28

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

6 named opening lines are classified under ECO code A28.

English Opening: Four Knights System, Nimzowitsch Variation — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e4
English Opening: King's English Variation, Four Knights Variation — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6
English Opening: King's English Variation, Four Knights Variation, Bradley Beach Variation — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.d4 e4
English Opening: King's English Variation, Four Knights Variation, Flexible Line — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.d3
English Opening: King's English Variation, Four Knights Variation, Korchnoi Line — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.a3
English Opening: King's English Variation, Four Knights Variation, Quiet Line — 1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.e3