The Agincourt Defense is a variation of the English Opening, catalogued as ECO A13. The line runs 1. c4 e6 2. Nf3 d5 3. b3 Nf6 4. Bb2 Be7 5. e3 O-O, reaching the position shown below after 10 half-moves.
Black holds the centre with pawns on d5, and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move after five moves. Black has castled while White’s king is still uncommitted.
On the English Opening generally: A flexible opening where White controls the center with c4. Can transpose into many different systems.
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The Agincourt Defense goes 1. c4 e6 2. Nf3 d5 3. b3 Nf6 4. Bb2 Be7 5. e3 O-O. It is a variation of the English Opening and is catalogued as ECO A13.
The Agincourt Defense is ECO A13. ECO codes group openings by their move order, so nearby codes cover closely related lines of the English Opening.
Stockfish evaluates the position after 1. c4 e6 2. Nf3 d5 3. b3 Nf6 4. Bb2 Be7 5. e3 O-O at +0.16 at depth 18, which is balanced. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Black holds the centre with pawns on d5, and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each. It is White to move. Black has castled while White’s king is still uncommitted.