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A00–A39 White first moves other than 1.e4, 1.d4
A45-A46 Queen's pawn game 1. d4 Nf6
A51-A52 Budapest gambit
A53-A55 Old Indian
A56 Benoni
A57-A59 Benko Gambit
A60-A79 Modern Benoni
A80-A99 Dutch
- A84 1.d4 f5 2.c4 ... dutch defense
B00–B19 1.e4 without 1...c5, 1...e6 or 1...e5
B20-B99 1.e4 c5: Sicilian Defence
B27 1. e4 c5 2. Nf3 g6 [
B94 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 Najdorf, 6.Bg5
C00-C19 1. e4 e6 French defence
C20–C99 1.e4 e5: Open Game
D00–D69 1.d4 d5 Closed Game
D70–D99 1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence
E00-E09 Catalan, closed 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2
E10 1.d4 Nf6 2.c4 e6 3.Nf3 Irregular Indian
- E10 1.d4 Nf6 2.c4 e6 3.Nf3 a6 Dzindzikhashvili defence
- E10 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d4 b5 Irregular Indian Blumenfeld counter-gambit
E16 Queen's Indian 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ Capablanca variation
E20-E59 Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4
E60-E99 1. d4 Nf6 2. c4 g6 King's Indian defence
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