French Defence: Advance Variation
It may look like black can win a pawn on d4 by cxd4 Nxd4 but white can take the black knight on d4 and a retake by black's queen is not an option because of Bb5+ and black loses a queen.
For explanation of theory tables see theory table and for notation see algebraic notation.
1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.Bd3 cxd4
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- Batsford Chess Openings 2 (1989, 1994). Garry Kasparov, Raymond Keene. ISBN 0-8050-3409-9.