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English Opening: Agincourt Defense, Catalan Defense – Playing Black
You've reached a key branching point in the English Opening. After 1.c4 e6 2.Nf3 d5 3.g3 c5, White has several options — but this position is far from settled. Over 22,794 games in the database, White scores 54.3%, Black scores 41.7%, and 4.0% end in draws. Stockfish rates this +0.45, a small edge for White. That means you are slightly worse, but completely in the fight. The real question is: can you punish White if they pick a second-rate move? Let's find out in the drill below.
Play the English Opening: Agincourt Defense, Catalan Defense against the engine
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Create a free account →The Critical Moment: How to Respond to 1.c4 e6 2.Nf3 d5 3.g3 c5
You've played ambitiously: after 1.c4, you developed with ...e6; after 2.Nf3, you challenged the centre with ...d5; and after 3.g3, you struck back with ...c5. This is the tabiya of the Agincourt Defense flowing into Catalan territory. White has the move and must decide how to treat your central pawn duo. The engine's top pick is cxd5, leading to cxd5 exd5 d4 Nc6, and gives White a tiny edge. But White has several other tries — some of them quite popular, some of them outright mistakes. Your task as Black is to understand which replies are dangerous and which give you immediate counterplay.
The Engine's Best Line: cxd5
If White plays 4.cxd5, you recapture with 4...exd5. Then 5.d4 challenges your centre, and after 5...Nc6 you develop naturally. This is the main theoretical line and the one that keeps the position balanced. White has no clever tricks here — just solid play. From this line, you can continue your development with ...Bg7 (your fianchettoed bishop will eye the long diagonal), ...Nf6, and kingside castling. The engine's evaluation (+0.45) reflects a small advantage for White based on the extra central space, but nothing that should trouble you if you play actively.
Statistics: What White Actually Plays
The most popular move by a wide margin is 4.Bg2 (10,559 games, White scores 54.5%), where White immediately fianchettoes. This is perfectly playable but doesn't refute your set-up. The second-most popular is 4.cxd5 (8,777 games, White scores 55.4%), which is the engine's recommendation. Other moves see much less action: 4.b3 (1,082 games, White 51.8%), 4.d4 (836 games, White 53.1%), 4.e3 (543 games, White 51.4%), and the curious 4.Na3 (289 games, White 41.5%). Notice that Na3 actually scores worse for White than any other option — a sign that Black has good play against it.
Punishing White's Mistakes
Three moves stand out as clear inaccuracies — and if your opponent plays one of them, you should feel confident. 4.b3 loses about 0.7 pawns of advantage compared to best play (cxd5 was better). 4.e3 also loses about 0.7 pawns (again, cxd5 was better). 4.Na3 loses about 0.6 pawns (cxd5 was better still). In all three cases, your plan is simple: develop your pieces actively, complete your kingside fianchetto with ...Bg7, and put pressure on White's centre. If White plays one of these inaccuracies, the position becomes equal or even slightly favourable for you — especially if you're ready for it.
Results across 22,794 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bg2 | 10,559 | 54.5% |
| cxd5 | 8,777 | 55.4% |
| b3 | 1,082 | 51.8% |
| d4 | 836 | 53.1% |
| e3 | 543 | 51.4% |
| Na3 | 289 | 41.5% |
Frequently asked questions
Is the English Opening: Agincourt Defense a good choice for Black?
Yes, it is perfectly sound. After 1.c4 e6 2.Nf3 d5 3.g3 c5, the statistics over 22,794 games show Black wins 41.7%, White wins 54.3%, and 4.0% are draws. The engine gives White only +0.45 — a tiny edge that is almost irrelevant in practical play. This is a solid, fighting opening for Black.
What is the difference between the Agincourt Defense and the Catalan?
The Agincourt Defense is Black's set-up after 1.c4 e6, while the Catalan normally arises after 1.d4 Nf6 2.c4 e6 3.g3. In this line, White's early Nf3 and g3 (rather than d4) creates a hybrid: Black's ...d5 and ...c5 challenges the centre immediately, giving it a Catalan flavour but with unique pawn structure possibilities.
Why is 4.Na3 a mistake in this position?
4.Na3 is an inaccuracy that loses about 0.6 pawns of advantage compared to the best move (4.cxd5). The knight on a3 is awkwardly placed and doesn't influence the centre. After 4.Na3, Black can continue developing naturally with ...Nc6, ...Bg7, and ...Nf6, and already stand at least equal. White's poor 41.5% score in 289 games confirms that this move is not to be feared.
How should Black respond to 4.Bg2?
4.Bg2 is the most popular move (10,559 games), and it's perfectly fine for White. Black should continue with ...Nc6, developing the knight and maintaining central tension. Then ...Bg7, ...Nf6, and castling are natural follow-ups. White won't capture on d5 immediately, so you'll need a plan — typically completing development and deciding later whether to play ...dxc4 or keep the tension.