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

ECO
B30

ECO
B31

ECO
B32

ECO
B33

ECO
B34

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6

1. e4 c5
2. Nf3 Nc6 3. d4

1. e4 c5 2. Nf3 Nc6
3. d4 cd4
4. Nd4 Nf6

1. e4 c5 2. Nf3 Nc6
3. d4 cd4
4. Nd4 g6

without 3. Bb5,
3. d4

without 3... cd4

without
5. Nc3, 5. c4

3. Bb5 without
3... g6

3... cd4 without
4. Nd4

5. Nc3 without
5... Bg7

4. Nd4 without
4... Nf6, 4... g6

5... Bg7 without
6. Be3

6. Be3 without
6... Nf6

6... Nf6 without
7. Bc4

ECO
B35

ECO
B36

ECO
B37

ECO
B38

ECO
B39

1. e4 c5 2. Nf3 Nc6
3. d4 cd4
4. Nd4 g6 5. c4

1. e4 c5 2. Nf3 Nc6 3. d4 cd4
4. Nd4 g6 5. c4 Bg7

1. e4 c5
2. Nf3 Nc6 3. d4 cd4
4. Nd4 g6

1. e4 c5 2. Nf3 Nc6 3. d4 cd4
4. Nd4 g6

5. Nc3 Bg7
6. Be3 Nf6 7. Bc4

without 5... Bg7

without 6. Be3

5. c4 Bg7 6. Be3

5. c4 Bg7
6. Be3 Nf6
7. Nc3 Ng4

without 6... Nf6

6... Nf6 without
7. Nc3

7. Nc3 without
7... Ng4