Home › Openings › English Opening › English Opening: Agincourt Defense › English Opening: Agincourt Defense, Catalan Defense English Opening: Agincourt Defense, Catalan Defense, Semi-Slav Defense ECO A13 · 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 c6 Practice this opening · Play against the computer