Catalan Opening: Open Defense, Classical Line
The Classical Line of the Open Catalan is 4...dxc4 5.Nf3 Be7, where Black takes the c4 pawn and develops quietly instead of defending it. White wants to regain c4 and use the g2 bishop on the long diagonal, while Black aims for ...a6, ...b5 or ...Nc6 to make that harder.
- Moves
- 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Be7
- ECO
- E05
- Engine
- +0.31 · a slight edge for White (Stockfish 17.1, depth 20)
- Played
- 693 games in our lichess sample
- White scores
- 53.6%
Key ideas for both sides
White
- Castle first, then Qc2 and a4, as in the top engine line, to win back c4 and stop ...b5.
- 6.Qa4+ forces ...c6 at once and wins the pawn back, though ...b5 then gains time on the queen.
- Ne5 hits c4 and opens the g2 bishop's diagonal toward c6 and a8.
- Once c4 falls, put the queen on c4 or c2 and the rooks on c1 and d1.
Black
- Castle, then answer Qc2 with ...a6 and ...b5 if allowed, keeping the extra pawn for now.
- The engine idea ...Nc6 and ...Qd5 hits d4 and challenges the white queen once it takes on c4.
- Do not hurry ...b5 if Ne5 is possible, since the long diagonal can hit the rook on a8.
- The c8 bishop goes to d7 or b7. Plan ...c5 to break White's d4 pawn later.
Plans and pawn structure
White is a pawn down for now but has a clear route to win it back. The usual plan is short castling, Qc2 and a4, then Qxc4. Black uses those moves to castle, play ...a6 and either ...b5 or ...Nc6, and fight for the center with ...Qd5 or ...c5. If Black gets ...c5 in with the pieces developed, the game is equal. If White keeps the long diagonal open and Black's queenside stays undeveloped, White's bishop on g2 dominates.
What the engine plays from here
Stockfish 17.1 at depth 20 rates the position +0.31: a slight edge for White. Its three top choices for White:
- +0.31 6.O-O O-O 7.Qc2 a6 8.a4 Nc6
- +0.24 6.Qa4+ c6 7.Qxc4 b5 8.Qd3 Bb7
- +0.12 6.Nc3 O-O 7.Ne5 Nc6 8.Bxc6 bxc6
Pawns, from White's side.
How it scores on lichess
693 rated lichess games reached this position; White scored 53.6%.
Light: White wins. Grey: draws. Dark: Black wins. About the sample.
How to play against it
As White, do not panic about the pawn. Castle, play Qc2 and a4 to stop ...b5, then recapture on c4. 6.Qa4+ is fine too, but expect ...c6 and ...b5. Avoid early queen trips that let Black gain more tempi, and keep the long diagonal open so the g2 bishop stays your best piece.
Other lines with this name
The lichess opening list also files this line under the same name, though it reaches a different position: 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 Be7 5.Bg2 O-O 6.O-O dxc4.
Questions
What are the moves of the Catalan Opening: Open Defense, Classical Line?
The Catalan Opening: Open Defense, Classical Line starts 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Be7. Its ECO code is E05.
Is the Catalan Opening: Open Defense, Classical Line good for Black?
Stockfish 17.1 rates the position +0.31 at depth 20, which is a slight edge for White. In 693 lichess games from our sample, White scored 53.6%. A sound, low-risk choice for Black players who like clear development; White needs patience to regain c4 without loosening anything.
What is the main idea of the Catalan Opening: Open Defense, Classical Line?
Black wins a pawn on c4 and develops normally, accepting that White will likely regain it. The point is to use White's recapturing moves to castle and prepare ...a6, ...b5 or ...Nc6 and ...Qd5.
What should White play next?
The engine's first choice is O-O, with Qa4+ and Nc3 close behind. 6.O-O puts the king safe first, because c4 can usually be regained later with Qc2 and a4.
Related lines
Updated October 2026. Sources and method.