ENCYCLOPAEDIA OF CHESS OPENINGS
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ECO
A

ECO
B

ECO
C

ECO
D

ECO
E


without 1.d4, 1.e4
1. e4 without
1... c5, 1... e6,
1... e5

1. e4 e6

1. d4 d5

1. d4 Nf6 2. c4 e6

1. d4 without
1... Nf6, 1... d5

1. e4 c5

1. e4 e5

1. d4 Nf6 2. c4 g6 with 3... d5

1. d4 Nf6 2. c4 g6 without 3... d5

1. d4 Nf6
without 2. c4
1. d4 Nf6 2. c4 without 2... e6,
2... g6