| name | 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 | Apertura de peón de rey | Hungary | 1.e4 Nf6 |
| Amar Opening | A00 | Modern Defense | 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 |