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

ECO
D90

ECO
D91

ECO
D92

ECO
D93

ECO
D94

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

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

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

1. d4 Nf6 2. c4 g6 3. Nc3 d5
4. Nf3 Bg7 5. e3

without 4... Bg7

without 5... 0-0

5. Bf4 0-0 6. e3

without 5... 0-0

4... Bg7 without
5. Bg5, 5. Bf4,
5. e3, 5. Qb3

5... 0-0 without
6. e3

5... 0-0 without
6. Qb3

ECO
D95

ECO
D96

ECO
D97

ECO
D98

ECO
D99

1. d4 Nf6 2. c4 g6 3. Nc3 d5
4. Nf3 Bg7 5. Qb3

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

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

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

5. e3 0-0 6. Qb3

without 5... dc4

5. Qb3 dc4

5. Qb3 dc4
6. Qc4 0-0
7. e4 Bg4

5. Qb3 dc4
6. Qc4 0-0
7. e4 Bg4

without 6. Qc4

without 8. Be3

8. Be3 Nfd7
9. Qb3

6. Qc4 without
6... 0-0

8. Be3 without
8... Nfd7

6... 0-0 without
7. e4

8... Nfd7 without
9. Qb3

7. e4 without
7... Bg4