ECO Codes
The ECO Codes is a clasification system for the chess openings moves. Below is a list of chess openings organized by the Encyclopaedia of Chess Openings (ECO) code. The openings are divided in five volumes labeled from "A" through "E".
| ECO | Moves | Opening | ||
| E12 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 | Queen's Indian defence | ||
| E13 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb7 5. Bg5 h6 6. Bh4 Bb4 | Queen's Indian, 4.Nc3, main line | ||
| E14 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 | Queen's Indian, 4.e3 | ||
| E15 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 | Queen's Indian, 4.g3 | ||
| E16 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ | Queen's Indian, Capablanca variation | ||
| E17 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 | Queen's Indian, 5.Bg2 Be7 | ||
| E18 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 | Queen's Indian, old main line, 7.Nc3 | ||
| E19 | 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 | Queen's Indian, old main line, 9.Qxc3 |