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

ECO
D70

ECO
D71

ECO
D72

ECO
D73

ECO
D74

1. d4 Nf6
2. c4 g6 3. g3 d5

1. d4 Nf6
2. c4 g6 3. g3 d5
4. Bg2 Bg7

1. d4 Nf6
2. c4 g6 3. g3 d5
4. Bg2 Bg7 5. Nf3

1. d4 Nf6
2. c4 g6 3. g3 d5
4. Bg2 Bg7

without 3. g3,
3. Nc3

without 4. Bg2

5. cd5 Nd5 6. e4

without 5... 0-0

5. Nf3 0-0

4. Bg2 without
4... Bg7

without 6. cd5,
6. 0-0

4... Bg7 without
5. cd5, 5. Nf3

6. cd5 without
6... Nd5

5. cd5 without
5... Nd5

6... Nd5 without
7. 0-0

5... Nd5 without
6. e4

7. 0-0 without
7... c5, 7... Nb6

ECO
D75

ECO
D76

ECO
D77

ECO
D78

ECO
D79

1. d4 Nf6 2. c4 g6 3. g3 d5
4. Bg2 Bg7

1. d4 Nf6 2. c4 g6 3. g3 d5
4. Bg2 Bg7

1. d4 Nf6
2. c4 g6 3. g3 d5
4. Bg2 Bg7

1. d4 Nf6 2. c4 g6 3. g3 d5
4. Bg2 Bg7

5. Nf3 0-0
6. cd5 Nd5
7. 0-0 c5

5. Nf3 0-0
6. cd5 Nd5
7. 0-0 Nb6

5. Nf3 0-0 6. 0-0

5. Nf3 0-0
6. 0-0 c6

5. Nf3 0-0
6. 0-0 c6 7. cd5

without 6... c6

without 7. cd5