ECO A13
ECO A00–A99 — Flank openings: 1.c4, 1.Nf3, 1.f4 and other first moves, plus early Indian and Benoni systems.
11 named opening lines are classified under ECO code A13.
- English Opening: Agincourt Defense — 1.c4 e6
- English Opening: Agincourt Defense, Bogoljubow Defense — 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Bd6
- English Opening: Agincourt Defense, Catalan Defense — 1.c4 e6 2.Nf3 d5 3.g3 c5
- English Opening: Agincourt Defense, Catalan Defense Accepted — 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 dxc4
- English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense — 1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Bg2 c6
- English Opening: Agincourt Defense, Kurajica Defense — 1.c4 e6 2.Nf3 d5 3.g3 c6
- English Opening: Agincourt Defense, Tarrasch Defense — 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 c5 5.b3 Nc6 6.O-O Be7
- English Opening: Agincourt Defense, Wimpy System — 1.c4 e6 2.Nf3 Nf6 3.b3 d5 4.Bb2 c5 5.e3
- English Opening: Neo-Catalan — 1.c4 e6 2.Nf3 d5 3.g3 Nf6
- English Opening: Neo-Catalan Declined — 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7
- English Opening: Romanishin Gambit — 1.c4 Nf6 2.Nf3 e6 3.g3 a6 4.Bg2 b5