English Opening: Agincourt Defense, Neo-Catalan Declined

1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O

ECO A14

The English Opening: Agincourt Defense, Neo-Catalan Declined is a chess opening line in the English Opening complex, reached after 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O.

It is catalogued under code A14 in the Encyclopaedia of Chess Openings (ECO).

The defining move O-O is chosen by White on move 5.

One named continuation branches from this position: the Early b3.

Named variations

• English Opening: Agincourt Defense, Neo-Catalan Declined, Early b3 — ECO A14

Study this line with a grandmaster

This position is covered in the Reti Opening course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.