Caissa Codex
Tree path 2 levels English Opening › Agincourt Defense
  1. Caissa Codex
  2. English Opening A10
  3. Agincourt Defense A13 you are here
A13

English Opening: Agincourt Defense

Open in Lichess
Share: X Reddit Telegram Facebook
Play from here → Click pieces to play, or use ← / → arrows.

Overview

English Opening: Agincourt Defense is a specific line in the Flank Openings family (ECO A13), arising from a recognised theoretical position.

The Flank Openings group covers flank openings — systems that delay the central pawn break and instead develop pieces and pawns on the wings.

It is reached after 2 plies of play, with the move sequence 1. c4 e6.

The line is a first-level refinement of English Opening.

The line has 7 documented children — English Defense: Hartlaub Gambit Accepted, English Defense: Hartlaub Gambit Declined, English Opening: Agincourt Defense, and others being widely played.

Below the direct variations, the full subtree contains 37 documented sub-variations.

Explore the position on the interactive board, study its real-world results from Lichess, and challenge the engine when you are ready.

ECO code
A13
Group
Flank Openings (A)
Plies
2
Parent
English Opening
Direct variations
7
Total in subtree
37

This overview is generated automatically from the opening's metadata. Know this line well? Write a description — submissions are reviewed before publishing.

Statistics from Lichess

11,163,707 games · White 49.6% / Draw 5.6% / Black 44.8%

MovesGamesW / D / B
Nc35,743,019
g31,771,966
d41,253,756
Nf3808,271
e3559,719
e4512,051
d3167,257
b3163,112

Source: Lichess Opening Explorer · cached 2026-09-26 00:41:46

Write a description

Markdown supported (headings ###, bold, lists, links). Submissions are reviewed before publishing.

Variations (7)

Related variations at the same level

Sister lines that share the same parent English Opening:

Show all 37 sub-variations (full subtree)

https://chesscodex.org/openings/english-opening-agincourt-defense