Najdorf Variation, Polugaevsky Variation, Simagin Line

Instead of taking at once with 10. exf6, White plays 10. Qe2, putting the queen on the e-file. A later exf6 then no longer allows Black to recover the piece with ...Qe5+ check. The f6-knight remains attacked, and Black almost always answers 10...Nfd7, which is also the engine's first choice, while 10...b4 is a rare alternative. The engine gives White a slight edge, and the line is seldom played.