Queen's Gambit Declined: Semi-Tarrasch Defense, San Sebastian Variation

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 c5 7.Nf3 cxd4 8.cxd4 Bb4+ 9.Bd2 Qa5

ECO D41

The Queen's Gambit Declined: Semi-Tarrasch Defense, San Sebastian Variation is a chess opening line in the Queen's Gambit Declined complex, reached after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 c5 7.Nf3 cxd4 8.cxd4 Bb4+ 9.Bd2 Qa5.

It is catalogued under code D41 in the Encyclopaedia of Chess Openings (ECO).

The defining move Qa5 is chosen by Black on move 9.

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This position is covered in the Opening Tricks Hall of Fame course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.