The Closed is a variation of the Catalan Opening, catalogued as ECO E08. The line runs 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Bf4 b6 9. Nbd2 Bb7 10. e4, reaching the position shown below after 19 half-moves.
Both sides have pawns in the centre (White on d4 and e4, Black on d5), and two pawn captures are available, so the structure is still fluid. Development is level at four minor pieces each. It is Black to move after ten moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the Catalan Opening generally: A sophisticated system combining Queen's Gambit ideas with a fianchettoed king's bishop.
You can play through this variation move by move in your browser — Learn mode walks the line with an explanation at each step, and Drill mode replays it from memory so you find out whether you actually know it. No account is required.
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The Closed goes 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Bf4 b6 9. Nbd2 Bb7 10. e4. It is a variation of the Catalan Opening and is catalogued as ECO E08.
The Closed is ECO E08. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Catalan Opening.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Qc2 c6 8. Bf4 b6 9. Nbd2 Bb7 10. e4 at +0.19 at depth 18, which is balanced. 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.
Both sides have pawns in the centre (White on d4 and e4, Black on d5), and two pawn captures are available, so the structure is still fluid. Development is level at four minor pieces each. It is Black to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.