Grünfeld Defense: Three Knights Variation

An entry in the Encyclopedia of Chess Openings (ECO D90), reached after 7 half-moves: 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3.

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4…Bg7 7 lines

About this opening

Grünfeld Defense: Three Knights Variation is an opening in the Encyclopedia of Chess Openings, classified under code D90. 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 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3.

It belongs to the Grünfeld Defense family. Within that family this is a sub-variation (the Three Knights Variation line).

The opening sequence in prose form: 1.d4 Nf6, 2.c4 g6, 3.Nc3 d5, 4.Nf3. From this position exactly one named continuation is recorded in the encyclopaedia.