About this opening
Neo-Grünfeld Defense: Classical Variation, Polgar Variation is an opening in the Encyclopedia of Chess Openings,
classified under code D77. 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. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d5 6. c4 Nc6.
The opening sequence in prose form: 1.d4 Nf6, 2.Nf3 g6, 3.g3 Bg7, 4.Bg2 O-O, 5.O-O d5, 6.c4 Nc6. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.