Board Position

One of the principal defences to the Queen's Gambit, this opening was first mentioned in 1590 but only became popular from the 1930's.
Black declines by 2..P-QB3 (move 2b, left) rather than the Orthodox Defence (2..P-K3), enabling the early deployment of his queen's bishop (as in move 5wb, right) in trying to maintain the centre and prevent White's P-K4.

Board Position
Variations include the Exchange Slav, the Slav Gambit (for the Tolusch-Geller Gambit), the Alekhine Variation, the Dutch Variation and also opportune transpositions into the Semi-Slav Defence (qv.) (where Black's additional P-K3 support shuts in his QB and usually leads to the Meran Variation).
Begin or Clear or Groups or see move: 1 d4 d5 2 c4 c6 to:
3 Nf3 Nf6 4 Nc3 dxc4 5 a4 Bf5 6 Ne5 e6 7 f3 Bb4 8 e4 Bxe4 9 fxe4 Ktxe4 10 Bd2 Qxd4 etc.
8 Bg5 c5 9 dxc5 Qd5 10 Qxd5 exd5 etc.