| name | named after | Code ECO | Parent | place of origin | moves |
|---|---|---|---|---|---|
| Albin Countergambit | D08–D09 | Queen's Gambit | Milan | 1.d4 d5 2.c4 e5 | |
| Alekhine's Defence | B02–B05 | King's Pawn Game | Hungary | 1.e4 Nf6 | |
| Amar Opening | A00 | Modern Defense, Monkey's Bum | France | 1.Nh3 | |
| Black Knights' Tango | A50 | Indian Defence | Germany | 1.d4 Nf6 2.c4 Nc6 | |
| Budapest Gambit | A51–A52 | Indian Defence | Germany | 1.d4 Nf6 2.c4 e5 |