Petrov's Defense

also known as: Russian Game · Petroff Defense

1. e4 e5 2. Nf3 Nf6

Named after

Alexander Petrov (1794–1867), Russia's first great master, unbeaten in his homeland for half a century.

Origin

Analyzed by Petrov and Carl Jaenisch in the 1840s — the first major Russian contribution to opening theory, hence its other name, the Russian Game.

The story

Instead of defending e5, Black counterattacks e4 symmetrically: 2...Nf6. The point is a tactical trap older than the theory — 3.Nxe5 Nxe4? loses to 4.Qe2, so Black must first insert 3...d6 — but the strategic point is deeper: perfect symmetry is remarkably hard to break. The Petrov became the fortress of choice for defensive virtuosos from Marshall (who used it as well as his gambit) to Karpov, Kramnik and, above all, Fabiano Caruana, whose Petrov in the late 2010s was so impregnable that elite players largely stopped testing it with 1.e4.

Why it matters

The defense that measures White's ambition: it concedes nothing structurally and dares White to prove anything at all. Its reputation for dryness is half-deserved and half-slander — the Cochrane Gambit (4.Nxf7!?) lives inside it.

Notable games

• Caruana's candidate-winning Petrovs, 2018
• Marshall's Petrov draws vs Lasker and Capablanca