A
- White first moves other than 1. e4, 1. d4 (A00–A39)
- 1. d4 without 1...d5 or 1...Nf6: Atypical replies to 1. d4 (A40–A44)
- 1. d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45–A49)
- 1. d4 Nf6 2.c4 without 2...e6 or 2...g6: Atypical Indian systems (A50–A79)
- 1. d4 f5: Dutch Defence (A80–A99)
Read more about this topic: List Of Chess Openings