Semi-Slav Defense: what should Black play?

In the Semi-Slav Defense, Black's most accurate response to the pin on the f6 knight is Nbd7, which provides an engine evaluation of +0.21. Developing the queen's knight supports the center, prepares potential counterplay against White's setup, and limits White to a 52.0% scoring rate across 1.56M recorded games (20.9% of games in the database).

The Strategic Choice: Nbd7 vs. Be7

While Nbd7 scores well and receives the lowest engine assessment, the most common choice by sheer volume is Be7, appearing in 62.5% of games (4.66M recorded). Playing Be7 immediately breaks the pin on the f6 knight, leading to an engine evaluation of +0.24, where White scores 54.4%. Choosing Nbd7 instead preserves the option of active piece placement for the dark-squared bishop or rapid counterattacks along the a5-e1 diagonal.

Illustrative Continuations

Following the top-rated move Nbd7, the engine highlights the concrete sequence Nbd7 e3 Qa5 cxd5 Nxd5 Qd2, where Black's queen actively challenges White's pinned minor pieces. For players opting to unpin with Be7, the variation often proceeds with Be7 e3 Nbd7 Qc2 O-O a3, solidifying both sides' setups before middlegame operations begin.

Other Black Alternatives

Black also tests White's dark-squared bishop immediately with h6, played in 8.5% of games (638K recorded) with an evaluation of +0.22, running into h6 Bh4 Be7 e3 O-O Qc2 where White scores 52.8%. More aggressive deviations include Bb4 (+0.44 evaluation across 568K recorded games) and the quiet a6 (+0.48 evaluation across 32K recorded games), though both grant White a slightly higher edge than the classical setups.