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

ECO
D40

ECO
D41

ECO
D42

ECO
D43

ECO
D44

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c5 5. cd5

1. d4 d5
2. c4 e6 3. Nc3 Nf6
4. Nf3 c5

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

1. d4 d5 2. c4 e6
3. Nc3 Nf6 4. Nf3 c6 5. Bg5 dc4

without 5. cd5

without 5... Nd5

5. cd5 Nd5 6. e3

without 5. Bg5,
5. e3

5... Nd5 without
6. e3

5. Bg5 without
5... dc4

ECO
D45

ECO
D46

ECO
D47

ECO
D48

ECO
D49

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

1. d4 d5 2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

without 5... Nbd7

5. e3 Nbd7 6. Bd3

5. e3 Nbd7
6. Bd3 dc4 7. Bc4

5. e3 Nbd7
6. Bd3 dc4
7. Bc4 b5

5. e3 Nbd7
6. Bd3 dc4
7. Bc4 b5

5... Nbd7 without
6. Bd3

without 6... dc4

without 7... b5

8. Bd3 a6

8. Bd3 a6
9. e4 c5 10. e5

7... b5 without
8. Bd3

without 9. e4

8. Bd3 without
8... a6

9. e4 without
9... c5

9... c5 without
10. e5