ECO A20
5 named openings and variations are classified as A20. ECO (Encyclopaedia of Chess Openings) codes group openings from A00 to E99 by their opening moves.
- English Opening: Drill VariationA201. c4 e5 2. g3 h5
- English Opening: King's English VariationA201. c4 e5
- English Opening: King's English Variation, Kahiko-Hula GambitA201. c4 e5 2. e3 Nf6 3. f4 exf4 4. Nf3
- English Opening: King's English Variation, Nimzowitsch VariationA201. c4 e5 2. Nf3
- English Opening: King's English Variation, Nimzowitsch-Flohr VariationA201. c4 e5 2. Nf3 e4