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. c4 e5 2. Nc3 Nf6 3. g3 c6
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1. c4 e5 2. Nc3 Nf6 3. g3 g6