ECO Codes
The Encyclopaedia of Chess Openings classifies the Queen's Indian under codes E12 to E19 according to the following scheme:
- E12 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6
- E13 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.Bg5
- E14 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3
- E15 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3
- E16 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7
- E17 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7
- E18 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3
- E19 – 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.Nc3 Ne4 8.Qc2
Read more about this topic: Queen's Indian Defense
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