The Petrosian System is a variation of the Catalan, Closed Variation, catalogued as ECO E07. The line runs 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8. Qd3, reaching the position shown below after 15 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at three minor pieces each. It is Black to move after eight moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the Catalan, Closed Variation generally: Black keeps the pawn structure closed with ...Be7 instead of capturing on c4. A solid positional approach where both sides maneuver carefully.
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 Petrosian System goes 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nf3 O-O 6. O-O Nbd7 7. Nc3 c6 8. Qd3. It is a variation of the Catalan, Closed Variation and is catalogued as ECO E07.
The Petrosian System is ECO E07. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Catalan, Closed Variation.
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. Nc3 c6 8. Qd3 at +0.35 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.
Both sides have pawns in the centre (White on d4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at three 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.