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1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 · ECO D34
Tarrasch Defense: Prague Variation, Main Line is a chess opening that arises after 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7. It is classified D34 in the ECO system, and the position after these moves has white to move. The Tarrasch Defense answers the Queen's Gambit with an immediate c5, accepting an isolated queen's pawn in exchange for free piece play and open lines. Siegbert Tarrasch argued that the activity was worth the structural weakness, against the prevailing opinion of his time.
A clean strategic trade-off. Black gets active pieces, open files, and easy development; White gets a permanent structural target on d5 and plays to reach an endgame where the isolated pawn is weak.
Players who prefer active pieces to solid structure and understand how to play with an isolated queen's pawn.
This line is a variation within the Tarrasch Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7.
Each of these is a named opening reached by playing on from 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7. Open any of them to load the position on the board.