English Opening: Agincourt Defense, Catalan Defense Accepted

An entry in the Encyclopedia of Chess Openings (ECO A13), reached after 8 half-moves: 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 dxc4.

Black rook — Use ← → arrows or click moves to step through.

Black knight — Use ← → arrows or click moves to step through.

End of this line

No further variations branch from this position in our database. To explore neighbouring ideas:

About this opening

English Opening: Agincourt Defense, Catalan Defense Accepted is an opening in the Encyclopedia of Chess Openings, classified under code A13. ECO group A (A00–A99) covers flank and irregular openings, including the English, Bird, Réti and Dutch defences. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. c4 e6 2. Nf3 Nf6 3. g3 d5 4. Bg2 dxc4.

It belongs to the English Opening family. Within that family this is a level-2 branch (the Agincourt Defense → Catalan Defense Accepted line). The immediate parent line is English Opening: Agincourt Defense, transitioned via 4…dxc4.

The opening sequence in prose form: 1.c4 e6, 2.Nf3 Nf6, 3.g3 d5, 4.Bg2 dxc4. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.