ECO family guide

Petrov's Defense — all variations and ECO codes

50 named lines across 2 ECO codes (C42–C43). Source: the CC0-licensed lichess.org opening database.

The main line

Position after 1.e4 e5 2.Nf3 Nf6 (C42). Open this line on Lichess → · Petrov's Defense on Lichess

How the main line scores at your rating

Real Lichess win rates for 1.e4 e5 2.Nf3 Nf6, playing as black — the family's other variations are not separately tracked for win rate yet, main line only.

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Win/draw/loss rate by rating band
Rating band	Games	White / draw / Black	Score for black
1400-1600	20,866,347	50.8% / 3.7% / 45.5%	47.4%
1600-1800	17,950,366	50.0% / 4.1% / 45.9%	47.9%
1800-2000	11,943,933	49.5% / 4.8% / 45.7%	48.1%
2000+	6,781,239	48.2% / 6.6% / 45.2%	48.5%

All 50 named variations

Every named line in the Petrov's Defense family, from the CC0-licensed ECO classification — not separately tracked for win rate, but every ECO code and move sequence is real, sourced data.

C42Petrov's Defense (main line) — 1.e4 e5 2.Nf3 Nf6
C42Petrov's Defense (main line) — 1.e4 e5 2.Nf3 Nf6 3.Nxe5
C42Petrov's Defense (main line) — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6
C42Petrov's Defense (main line) — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3
C42Petrov's Defense (main line) — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4
C42Classical Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4
- C42Berger Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1 Bg4 9.c3 f5 10.Nbd2
- C42Chigorin Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1
  - C42Browne Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4 Nb4 9.cxd5
  - C42Main Line — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4 Nb4 9.Be2
- C42Closed Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 Nf6
- C42Jaenisch Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.c4
- C42Krause Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6 7.O-O Be7 8.Re1 Bg4 9.c3 f5 10.c4
- C42Marshall Trap — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 Bg4 9.cxd5 f5 10.Re1 Bxh2+
- C42Marshall Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6
  - C42Chinese Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 c6 9.Re1 Bg4
- C42Maróczy Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1 Bg4 9.c3 f5 10.c4 Bh4
- C42Mason Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O O-O
- C42Mason-Showalter Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6
- C42Staunton Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 c6
- C42Tarrasch Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 Bg4
C42Cochrane Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7
- C42Bishop Check Line — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7 Kxf7 5.Bc4+
- C42Center Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7 Kxf7 5.d4
C42Cozio Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2
C42Damiano Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4
- C42Kholmov Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Qe7
C42French Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d3
C42Italian Variation — 1.e4 e5 2.Nf3 Nf6 3.Bc4
C42Karklins-Martinovsky Variation — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nd3
C42Kaufmann Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.c4
C42Millennium Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Bd3
C42Moody Gambit — 1.e4 e5 2.Nf3 Nf6 3.Qe2 Nc6 4.d4
C42Nimzowitsch Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Nc3
C42Paulsen Attack — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nc4
C42Stafford Gambit — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6
C42Stafford Gambit Accepted — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6
C42Stafford Gambit Accepted — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6 5.Nc3 Bc5
C42Stafford Gambit Accepted — 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6 4.Nxc6 dxc6 5.d3 Bc5
C42Three Knights Game — 1.e4 e5 2.Nf3 Nf6 3.Nc3
C43Modern Attack — 1.e4 e5 2.Nf3 Nf6 3.d4
C43Modern Attack — 1.e4 e5 2.Nf3 Nf6 3.d4 exd4
- C43Bardeleben Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2 Nc5 6.Nxd4 Nc6
- C43Center Attack — 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qxd4
- C43Center Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3
- C43Murrey Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 Nc6
- C43Steinitz Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qe2
- C43Symmetrical Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 d5
- C43Tal Gambit — 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Bb5
- C43Trifunovic Variation — 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Bd6 6.O-O O-O 7.c4 Bxe5