The with 5...c5 is a variation of the Catalan, Open Defense, catalogued as ECO E04. The line runs 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 c5, reaching the position shown below after 10 half-moves.
White holds the centre with pawns on d4, and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each, and Black is up a pawn of material. It is White to move after five moves. Black has doubled pawns on the c-file.
On the Catalan, Open Defense generally: Black captures the c4 pawn in the Catalan. White's fianchettoed bishop exerts long-term pressure while Black tries to hold the extra pawn.
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See all 5 Catalan, Open Defense variations →
The with 5...c5 goes 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 c5. It is a variation of the Catalan, Open Defense and is catalogued as ECO E04.
The with 5...c5 is ECO E04. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Catalan, Open Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 c5 at +0.36 at depth 18, which is a slight pull for White, within normal opening margins. 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.
White holds the centre with pawns on d4, and one pawn capture is available, so the structure has not settled yet. Development is level at two minor pieces each, and Black is up a pawn of material. It is White to move. Black has doubled pawns on the c-file.