ENCYCLOPAEDIA OF CHESS OPENINGS
»ECO Code« is a trademark of Chess Informant Inc.

ECO
C0

ECO
C1

ECO
C2

ECO
C3

ECO
C4

1. e4 e6 2. d4 d5
3. Nc3

1. e4 e5

1. e4 e5 2. f4

1. e4 e5 2. Nf3

without 2. d4

without 2. f4,
2. Nf3

without 2... Nc6

2. d4 without
2... d5

2... Nc6 without
3. Bc4, 3. Bb5

2... d5 without
3. Nc3

ECO
C5

ECO
C6

ECO
C7

ECO
C8

ECO
C9

1. e4 e5
2. Nf3 Nc6 3. Bb5

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
4. Ba4 Nf6 5. 0-0

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6
4. Ba4 Nf6

without 3... a6

without 4... Nf6

5... Ne4

5. 0-0 Be7
6. Re1 b5
7. Bb3 d6

3... a6 without
4. Ba4

4... Nf6 without
5. 0-0

5... Be7 without
6. Re1

5. 0-0 without
5... Ne4, 5... Be7

6. Re1 without
6... b5

6... b5 7. Bb3 without 7... d6