Library/Openings/Queen's Gambit Declined/Harrwitz Attack/Two Knights Defense ECO D37
Opening· 12 plies

Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense

An entry in the Encyclopedia of Chess Openings (ECO D37), reached after 12 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 Nbd7.

Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense ECO D37
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Black rook
Black bishop
Black queen
Black rook
Black king
Black pawn
Black pawn
Black pawn
Black knight
Black bishop
Black pawn
Black pawn
Black pawn
Black pawn
Black knight
Black pawn
White pawn
White pawn
White bishop
White knight
White pawn
White knight
White pawn
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White pawn
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White pawn
White rook
White queen
White king
White bishop
White rook
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About this opening

Queen's Gambit Declined: Harrwitz Attack, Two Knights Defense is an opening in the Encyclopedia of Chess Openings, classified under code D37. ECO group D (D00–D99) covers closed games and semi-closed games beginning 1.d4 d5, covering the Queen's Gambit, Slav, Grünfeld and related queen-pawn structures. This particular variation is reached after 12 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 Nbd7.

It belongs to the Queen's Gambit Declined family. Within that family this is a level-2 branch (the Harrwitz Attack → Two Knights Defense line). The immediate parent line is Queen's Gambit Declined: Harrwitz Attack, transitioned via 6…Nbd7.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 d5, 4.Nc3 Be7, 5.Bf4 O-O, 6.e3 Nbd7. From this position exactly one named continuation is recorded in the encyclopaedia.