The Agincourt Defense, Neo-Catalan Declined is a variation of the English Opening, catalogued as ECO A14. The line runs 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. O-O Be7 5. c4 O-O 6. b3 c5, reaching the position shown below after 12 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 six moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
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, Neo-Catalan Declined goes 1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. O-O Be7 5. c4 O-O 6. b3 c5. It is a variation of the English Opening and is catalogued as ECO A14.
The Agincourt Defense, Neo-Catalan Declined is ECO A14. 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. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. O-O Be7 5. c4 O-O 6. b3 c5 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. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.