Library/Openings/Petrov's Defense/Classical Attack/Marshall Variation ECO C42
Opening· 12 plies

Petrov's Defense: Classical Attack, Marshall Variation

An entry in the Encyclopedia of Chess Openings (ECO C42), reached after 12 half-moves: 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6.

Petrov's Defense: Classical Attack, Marshall Variation ECO C42
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Black rook
Black knight
Black bishop
Black queen
Black king
Black rook
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black bishop
Black pawn
White pawn
Black knight
White bishop
White knight
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White rook
White knight
White bishop
White queen
White king
White rook
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  5. 3.
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  11. 6.
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About this opening

Petrov's Defense: Classical Attack, Marshall Variation is an opening in the Encyclopedia of Chess Openings, classified under code C42. ECO group C (C00–C99) covers open games (1.e4 e5) and the French Defence, including the Ruy Lopez, Italian, Scotch and King's Gambit. This particular variation is reached after 12 half-moves from the starting position, with the move sequence 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bd6.

It belongs to the Petrov's Defense family. Within that family this is a level-2 branch (the Classical Attack → Marshall Variation line). The immediate parent line is Petrov's Defense: Classical Attack, transitioned via 6…Bd6.

The opening sequence in prose form: 1.e4 e5, 2.Nf3 Nf6, 3.Nxe5 d6, 4.Nf3 Nxe4, 5.d4 d5, 6.Bd3 Bd6. From this position exactly one named continuation is recorded in the encyclopaedia.