Petrov Defense (Russian Defense)

Strategic Summary & Main Idea

The Petroff Defence answers attack with attack: instead of defending e5, Black hits e4. The position after 2...Nf6 measures +0.41, and the number misleads — it reflects the tabiya before any exchange. Once the main line unfolds, with 5.d4 d5 and full symmetry, the evaluation falls to exactly 0.00. That is why the Petroff has a reputation as a drawing defence at the top, and why Kramnik and Caruana used it to neutralise 1.e4 in games they could not lose. What this entry adds is what happens when the symmetry is broken in the wrong order — and that costs the queen on move four.

The pawn structure this opening produces

The Petroff produces two structures, and the difference between them is the whole defence. The first is the symmetrical one, born of 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5: pawns on d4 and d5, knights on e4 and e5 or already traded, and no imbalance at all. In that structure the light-squared bishop is the most important piece on both sides, because e4 (or e5) is the only contested square; whoever installs a pawn-backed knight there holds the only advantage available. The second structure arises when White plays 3.d4 or 5.Nc3, giving up the symmetry: there the e5 pawn disappears early, the centre opens and the game becomes pure development, with the e-file as the battlefield. The symmetrical structure explains the defence's reputation — few pieces and few targets lead to level endings — but it also hides the real risk. Because the two positions mirror each other, a lost move weighs double: there is no structural weakness to compensate for a tempo, and the same symmetry that holds the draw turns a move-order slip into an immediate loss.

Main Variations of the Petrov Defense (Russian Defense)

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

Frequently asked questions

Is the Petroff really a drawing defence?

The main line measures exactly 0.00 after fourteen moves, so the reputation has a basis. But the draw is not automatic: the starting tabiya measures +0.41, and reaching the symmetrical position takes the right move order. Anyone who gets that order wrong on move three loses the queen, which is the opposite of a safe draw.

How does White play for an advantage against the Petroff?

By breaking the symmetry. The modern version with 8.c4 measures +0.23 and Steinitz's 3.d4 measures +0.42 — the highest in this entry. The alternative of 5.Nc3, trading Black's active knight, measures +0.27. None of them is large, which is why the Petroff stays in the repertoire of anyone who needs half a point with Black.

Does the Cochrane Gambit work?

Against correct defence, no. After 4.Nxf7 Kxf7 5.d4 c5, giving material back instead of hoarding it, the position measures −1.63 for White. It works when the opponent tries to keep the piece and leaves the king in the centre — which is exactly what the gambit wants, and not what it forces.

Guides on this opening

• The Italian Game: plans, common mistakes and the modern Giuoco Pianissimo
• The Berlin Defence: the wall, the endgame it forces and the anti-Berlins that give equality back

Common Mistakes & Where Most Amateurs Go Wrong

• 01 Capturing on e4 without ...d6 first. After 3...Nxe4 4.Qe2 the knight has no good square, and 4...Nf6 loses the queen to the discovered check 5.Nc6+ — the best-known trap in the whole opening, and still the most effective. The line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Nf6 5.Nc6+ +8.36
• 02 Escaping the trap with 4...Qe7 and then defending e5 with ...f6. The exchange on e5 leaves Black with an exposed king and a pawn down on the open file: +1.77. The line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Qe7 5.Qxe4 d6 6.d4 f6 7.Nc3 dxe5 8.dxe5 +1.77
• 03 Playing ...d5 before recovering the pawn. White's knight sits comfortably on e5, Black regains nothing, and the position measures +0.71 — nearly double the starting tabiya. The line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d5 4.d4 Nxe4 5.Bd3 Nd6 6.O-O Be7 7.Re1 +0.71