A14 English Opening: Agincourt Defense, Neo-Catalan Declined
Also filed here: Réti Opening.
A14 holds 12 named lines from two openings, most of them (ten) under English Opening. It leaves A13 (English Opening: Neo-Catalan Declined) with 5.O-O. Black, to move in that position, has 34 legal moves, the fourth-highest count of the 29 English Opening codes. White has castled kingside on move 5, while the other king still stands on its first square. No other English Opening code shares this. With 12 named lines it is the fifth-largest code of the 29 English Opening codes.
| # | White | Black |
|---|---|---|
| 1 | c4 | e6 |
| 2 | Nf3 | d5 |
| 3 | g3 | Nf6 |
| 4 | Bg2 | Be7 |
| 5 | O-O |
Moves only A14 plays
Same as A33 up to 2.Nf3, then:
- 2...d5 The d-pawn advances two squares to d5, covering c4 and e4, opening a line for the bishop on c8 and the queen on d8.
- 3.g3 The g-pawn advances to g3, covering f4 and h4, opening a line for the bishop on f1.
- 3...Nf6 The knight leaves g8 for f6, opening a line for the rook on h8.
- 4.Bg2 The bishop leaves f1 for g2, opening a line for the rook on h1, guarding the rook on h1.
- 4...Be7 The bishop leaves f8 for e7, opening a line for the rook on h8.
- 5.O-O White castles kingside, opening a line for the queen on d1, guarding the bishop on g2.
Lines filed under A14
They begin with two different first moves.
| Name | After the shared start | Plies | At the end |
|---|---|---|---|
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O | 9 | White castled |
| English Opening: Agincourt Defense, Neo-Catalan Declined, Early b3 | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.b3 | 9 | |
| English Opening: Agincourt Defense, Neo-Catalan Declined, Early b3 | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.b3 b6 | 10 | |
| English Opening: Agincourt Defense, Neo-Catalan Declined, Early b3 | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.b3 c5 | 10 | |
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O O-O 6.b3 | 11 | both castled |
| Réti Opening: Anglo-Slav Variation | 1.Nf3 d5 2.c4 c6 3.g3 Nf6 4.Bg2 e6 5.b3 Be7 6.Bb2 | 11 | |
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.c4 O-O 6.b3 c5 | 12 | both castled |
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.c4 O-O 6.b3 c5 7.e3 | 13 | both castled |
| Réti Opening: Anglo-Slav Variation, Bogoljubow Variation, Stonewall Line | 1.Nf3 d5 2.c4 e6 3.g3 Nf6 4.Bg2 Be7 5.O-O O-O 6.b3 c6 7.Bb2 | 13 | both castled |
| English Opening: Agincourt Defense, Keres Defense | 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O c5 6.cxd5 Nxd5 7.Nc3 Nc6 | 14 | White castled |
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.c4 O-O 6.b3 c5 7.e3 d4 | 14 | both castled |
| English Opening: Agincourt Defense, Neo-Catalan Declined | 1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.c4 O-O 6.b3 c5 7.e3 Nc6 | 14 | both castled |
The road to A14
- 1.c4 … 3.g3four earlier stops: A10, A13
- 3...Nf6A13 Neo-Catalan
- 4...Be7A13 Neo-Catalan Declined
- 5.O-OA14
The position after 5.O-O
White has brought out the knight on f3 and bishop on g2; Black the knight on f6 and bishop on e7. Black could capture with dxc4. Undefended and attacked: the pawn on c4.
Closest boards in other codes
| Code | Line | Differs on |
|---|---|---|
| E06 | Catalan Opening: Closed | six squares: e1, f1, g1, h1, d2, d4 |
| E05 | Catalan Opening: Open Defense, Classical Line | eight squares: e1, f1, g1, h1, d2, c4, d4, d5 |
| E07 | Catalan Opening: Closed | eight squares: d2, d4, d7, b8, e8, f8, g8, h8 |
| E01 | Catalan Opening: Open Defense | nine squares: e1, f1, g1, h1, d2, f3, d4, e7 … |
| A93 | Dutch Defense: Stonewall Variation, Botvinnik Variation | ten squares: b2, d2, b3, d4, f5, f7, e8, f8 … |
| A96 | Dutch Defense: Classical Variation | ten squares: d2, d4, d5, f5, d6, f7, e8, f8 … |
| D73 | Neo-Grünfeld Defense: with g3 | ten squares: e1, f1, g1, h1, d2, d4, e6, g6 … |