ECO Codes
The ECO Codes is a classification 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".
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1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3
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1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5
- 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 d5 6. Bd3 Nc6 7. O-O dxc4