ChessScreenshot

Petrov Defense

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 · C42–C43

Starting positionWhite to move

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Symmetry with a purpose

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The idea

Black answers the attack on e5 by attacking e4 with the other knight — a symmetrical, resilient defence that trades the symmetry for real counterplay.

Main line: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6

What White wants

  • Take on e5, then build the centre once Black recovers the pawn on e4
  • Play c4 against d5 and use Nc3 or Re1 to challenge the e4 knight
  • Use the small space advantage to squeeze in the endgame

What Black wants

  • Copy White's structure and trade pieces at every opportunity
  • Challenge the centre with ...d5 and ...Nc6
  • Aim for the drawish but completely safe endgame

Key idea

Understand this and the moves stop needing to be memorised.

Symmetry with a purpose

Black first uses ...d6 to dislodge the knight on e5, then recovers the pawn with ...Nxe4. White builds with d4 and can play c4 against the supporting d5 pawn. The c4 pawn does not attack e4; Nc3 and Re1 are ways to challenge the knight directly.

Common mistake

Recapturing on e4 before driving the white knight away from e5. After the premature ...Nxe4, Qe2 pins the knight to the king and makes Black's attempt to copy White's capture tactically awkward.

Mistake example: Qe2.

Representative position

The position this opening is aiming at. Copy the FEN, or open it in the analysis board and let the engine tell you what it is worth.

r1bqkb1r/ppp2ppp/2n5/3p4/3Pn3/3B1N2/PPP2PPP/RNBQK2R w KQkq - 2 7

Analyze this position

Variations

1 line branching from here.

Traps in this opening

Moves in this opening that look natural and lose.

Stafford Gambit Queen-Bait MateThe g5 bishop appears to pin the f6 knight. When it moves to e4, taking the queen seems to punish Black immediately.Petrov Symmetry Queen Trap...Nf6 saves the attacked knight and returns it to a natural developing square. Black expects the material symmetry to remain intact.
All opening traps

Related openings

Petrov Defense: Classical Variation1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 · C42The main line: White builds a broad centre with d4 and c4 and Black develops carefully, accepting a slightly cramped but very solid position.Philidor Defense1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7 · C41Black defends e5 with the d-pawn, keeping the position compact and conceding the bishop on f8 a passive but extremely solid role.Four Knights Game1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 · C46–C49Both sides develop all four knights before committing a pawn, producing one of the most solid and symmetrical openings in chess.Ruy Lopez1.e4 e5 2.Nf3 Nc6 3.Bb5 · C60–C99White develops the bishop to b5, attacking the knight that defends e5 — pressure that lasts for the next twenty moves and defines the whole opening.