Tarrasch Defense

Strategic Summary & Main Idea

The Tarrasch Defence accepts an isolated pawn on move three in exchange for active pieces and a position that plays itself. The evaluation after 3...c5 is +0.29, and the main line with 9.Bg5 rises to +0.42 — the isolani charges. The version the engine prefers for Black is the Rubinstein, where the exchange on c5 comes before the pin and the position drops to +0.13. Siegbert Tarrasch defended it all his life against the opinion of his age, and Kasparov used it in a world championship. What this entry measures is where the isolated pawn stops being dynamic and becomes merely weak.

The pawn structure this opening produces

Everything in the Tarrasch turns on one pawn: the isolated d5, which appears after cxd5 exd5 and the exchange on c5 or d4. An isolated pawn has two opposite properties, and the game decides which is worth more. It controls c4 and e4, gives Black's pieces an advanced base on d4 and opens the c- and e-files for the rooks — that is the dynamic side. And it cannot be defended by another pawn, needs a piece, and the square in front of it, d4, is a permanent outpost for a white knight — that is the static side. The practical rule that follows is familiar: the isolani is strong in a piece middlegame and weak in an endgame. That is why White trades pieces and Black avoids trades, and why the line with 9.Bg5, which forces the f6 knight off, measures more than the version where that trade does not happen. The Tarrasch's second structure appears when Black pushes ...c4 instead of exchanging: the isolani disappears, the position closes and Black has a queenside majority — but with no active pieces, which was the entire argument. It is the most expensive error in this entry.

Main Variations of the Tarrasch Defense

Evaluations measured by us with Stockfish 19, depth 22, on 14/09/2026.

Frequently asked questions

Is the Tarrasch's isolated pawn a weakness?

It is both things, and what decides is how many pieces are left. With pieces it gives Black c4 and e4, a base on d4 and two open files; without pieces it is just a pawn needing a defender. That is why the line with 9.Bg5, which trades the f6 knight, measures +0.42, and the Rubinstein, which avoids that trade, measures +0.13.

Is the Tarrasch good for a club player?

It is one of the best choices against 1.d4 for anyone who prefers plans to memory: the pieces all come to natural squares and the structure repeats game after game. The cost is measured — +0.29 after 3...c5 — and concentrated in a single concept. Players who understand isolated pawns play the Tarrasch well; those who do not lose the endgame.

Is it worth pushing ...c4 to avoid the isolated pawn?

No. The advance solves the static problem and destroys the dynamic argument: with no open files and no squares for the pieces, Black has a queenside majority and nothing to do with it. The e4 break arrives within two moves and the position measures +1.96 — more than six times the starting evaluation.

Guides on this opening

• Traps in the Queen's Gambit Declined: how not to lose a piece in the opening

Common Mistakes & Where Most Amateurs Go Wrong

• 01 Pushing ...c4 instead of exchanging. The pawn stops being isolated and Black stops having activity; the e4 break arrives within two moves and the position rises to +1.96. The line: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 c4 6.e4 dxe4 7.Nxe4 Nf6 8.Nxf6+ Qxf6 9.Bxc4 +1.96
• 02 Capturing on d5 with the knight after Black has exchanged on d4 and developed the bishop to e6. The capture loses material in the sequence and the position collapses to −6.01. The line: 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 cxd4 10.Nxd4 Nxd4 11.Qxd4 Be6 12.Nxd5 −6.01