Board Position
A defence against the Queen's Gambit where Black seeks piece mobility via an isolated QP. Developed by Dr.Siegbert Tarrasch (1862-1934), a German chess grandmaster and voluminous analyst of the openings. Board Position
After declining the gambit by an orthodox 2..P-K3, Black advances his QBPawn to QB4(c5) (move 3, left) in a vigorous fight for control of White's Q4(d4), tending to leave Black an isolated QP but gaining active play.
White usually fianchettoes his KB (move 7, right) and has the advantage if he can retain control of his Q4. Variations include the Hennig-Schara Gambit (sacrificing Black's QP in exchange for a couple of tempi), the Symmetrical Variation and the Tarrasch Gambit.

Begin Clear or Groups or see move: 1 d4 d5 2 c4 e6 3 Nc3 3..c5
(Main:) 4 cxd5 exd5 5 Nf3 Nc6 6 g3 Nf6 7 Bg2 Be7 8 0-0 0-0 9 Bg5 cxd4 10 Nxd4 Nxd4