ECO chess codes D7 (idea)

70 - Gruenfeld defence 
1. d4 Nf6   
2. c4 g6

D71 - Grunfeld Defence/Fianchetto Variation
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. cd5 Nd5

D72
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. cd5 Nd5   
6. e4 Nb6
7. Ne2

D73
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O

D74
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O  
6. cd5 Nd5   
7. O-O

D75
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O
6. cd5 Nd5   
7. O-O c5

D76
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O
6. cd5 Nd5   
7. O-O Nb6

D77
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O
6. O-O

D78 - Grunfeld Defence/Fianchetto Variation/Schlechter System
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O   
6. O-O c6

D79 - Grunfeld Defence/Fianchetto Variation
1. d4 Nf6   
2. c4 g6   
3. g3 d5   
4. Bg2 Bg7   
5. Nf3 O-O   
6. O-O c6
7. cd5 cd5