Petrov's Defense — opening family

50 catalogued lines · ECO C42–C43

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The shortest catalogued line of the family runs 1. e4 e5 2. Nf3 Nf6 — the position below. The continuation chips count how many catalogued lines extend this head with each next move; any branch can be explored on the interactive tree and played against the engine from there.

Main continuations

Nxe5 · 36 d4 · 10 Bc4 · 1 Nc3 · 1 Qe2 · 1

All 50 lines

Name	ECO	Main line length
Petrov's Defense	C42	4 plies
Petrov's Defense: Modern Attack	C43	5 plies
Petrov's Defense: Italian Variation	C42	5 plies
Petrov's Defense: Three Knights Game	C42	5 plies
Petrov's Defense	C42	5 plies
Petrov's Defense: Modern Attack, Symmetrical Variation	C43	6 plies
Petrov's Defense	C42	6 plies
Petrov's Defense: Modern Attack	C43	6 plies
Petrov's Defense: Stafford Gambit	C42	6 plies
Petrov's Defense: Damiano Variation	C42	6 plies
Petrov's Defense: Moody Gambit	C42	7 plies
Petrov's Defense: Karklins-Martinovsky Variation	C42	7 plies
Petrov's Defense	C42	7 plies
Petrov's Defense: Paulsen Attack	C42	7 plies
Petrov's Defense: Modern Attack, Center Variation	C43	7 plies
Petrov's Defense: Cochrane Gambit	C42	7 plies
Petrov's Defense: Modern Attack, Murrey Variation	C43	8 plies
Petrov's Defense	C42	8 plies
Petrov's Defense: Damiano Variation, Kholmov Gambit	C42	8 plies
Petrov's Defense: Stafford Gambit Accepted	C42	8 plies
Petrov's Defense: Modern Attack, Tal Gambit	C43	9 plies
Petrov's Defense: Modern Attack, Steinitz Variation	C43	9 plies
Petrov's Defense: Kaufmann Attack	C42	9 plies
Petrov's Defense: Classical Attack	C42	9 plies
Petrov's Defense: French Attack	C42	9 plies
Petrov's Defense: Modern Attack, Center Attack	C43	9 plies
Petrov's Defense: Cochrane Gambit, Center Variation	C42	9 plies
Petrov's Defense: Millennium Attack	C42	9 plies
Petrov's Defense: Cozio Attack	C42	9 plies
Petrov's Defense: Nimzowitsch Attack	C42	9 plies
Petrov's Defense: Cochrane Gambit, Bishop Check Line	C42	9 plies
Petrov's Defense: Classical Attack, Closed Variation	C42	10 plies
Petrov's Defense: Stafford Gambit Accepted	C42	10 plies
Petrov's Defense: Stafford Gambit Accepted	C42	10 plies
Petrov's Defense: Classical Attack, Mason-Showalter Variation	C42	12 plies
Petrov's Defense: Classical Attack, Marshall Variation	C42	12 plies
Petrov's Defense: Modern Attack, Bardeleben Variation	C43	12 plies
Petrov's Defense: Classical Attack, Mason Variation	C42	14 plies
Petrov's Defense: Modern Attack, Trifunovic Variation	C43	14 plies
Petrov's Defense: Classical Attack, Jaenisch Variation	C42	15 plies
Petrov's Defense: Classical Attack, Chigorin Variation	C42	15 plies
Petrov's Defense: Classical Attack, Staunton Variation	C42	16 plies
Petrov's Defense: Classical Attack, Tarrasch Variation	C42	16 plies
Petrov's Defense: Classical Attack, Chigorin Variation, Main Line	C42	17 plies
Petrov's Defense: Classical Attack, Chigorin Variation, Browne Attack	C42	17 plies
Petrov's Defense: Classical Attack, Marshall Variation, Chinese Gambit	C42	18 plies
Petrov's Defense: Classical Attack, Krause Variation	C42	19 plies
Petrov's Defense: Classical Attack, Berger Variation	C42	19 plies
Petrov's Defense: Classical Attack, Maróczy Variation	C42	20 plies
Petrov's Defense: Classical Attack, Marshall Trap	C42	20 plies