Semi-Slav Defense, Stoltz Variation

The Stoltz Variation is defined by White’s queen on c2 in a Semi-Slav position. In algebraic notation, Q means queen, so 6.Qc2 says the queen reaches c2 on White’s sixth move. It does so before the f1-bishop commits to d3. From c2, the queen supports the e4 advance and may combine with a later bishop on d3 along the diagonal toward h7. The main idea is not an immediate attack but waiting to see whether Black captures on c4 and how Black activates the pieces.

This move order is called Anti-Meran because White avoids entering the direct Meran sequence with Bd3, ...dxc4, Bxc4, and ...b5. If Black captures on c4 first, White can decide where the bishop belongs after recovering the pawn. If Black continues with ...Bd6, White has quiet plans with Bd3 as well as sharper central advances.

What Qc2 adds and demands

• It supports e4 without blocking the c1-bishop or fixing the f1-bishop's square.
• It keeps the answer to ...dxc4 flexible because Bd3 can be played after the pawn is recovered.
• It places the queen actively but requires care with central breaks that may open lines against it.

In the Chigorin Defense, White plays Bd3 first and Black answers ...Bd6. The Stoltz reverses that order: Qc2 preserves the bishop's choice and makes e4 a more immediate strategic threat.