A13

English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense

1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 c6

The English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense is a chess opening classified under ECO code A13. It is reached after the moves 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 c6.

It belongs to the English Opening family — one of many ways the line can branch. Understanding the parent system’s plans is the fastest way to play this variation well.

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