Queen's Gambit Declined: Modern Variation

An entry in the Encyclopedia of Chess Openings (ECO D50), reached after 7 half-moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5.

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4…Be7 2 lines
- D53 Heral Variation
- D55 Normal Line
4…Nbd7 1 line
- D51 Knight Defense

About this opening

Queen's Gambit Declined: Modern Variation is an opening in the Encyclopedia of Chess Openings, classified under code D50. 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 7 half-moves from the starting position, with the move sequence 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5.

It belongs to the Queen's Gambit Declined family. Within that family this is a sub-variation (the Modern Variation line).

The opening sequence in prose form: 1.d4 d5, 2.c4 e6, 3.Nc3 Nf6, 4.Bg5. From this position 2 named continuations are recorded in the encyclopaedia, each leading to a distinct theoretical line.