ECO chess codes D9

D90 - Grunfeld Defence
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3

D91      
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Bg5

D92  
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Bf4

D93
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Bf4 O-O   
6. e3

D94 - Grunfeld Defence/Quiet System
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. e3

D95
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. e3 O-O   
6. Qb3

D96 - Grunfeld Defence/Russian system
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Qb3

D97
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Qb3 dc4
6. Qc4 O-O   
7. e4

D98
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Qb3 dc4
6. Qc4 O-O   
7. e4 Bg4

D99 - Grunfeld Defence/Russian system/Smyslov variation
1. d4 Nf6   
2. c4 g6   
3. Nc3 d5   
4. Nf3 Bg7   
5. Qb3 dc4
6. Qc4 O-O   
7. e4 Bg4 
8. Be3 Nfd7   
9. Qb3