Classical Variation, Réti Variation

The Réti Variation meets the recapture 9...Bxc5 with 10. Na4, which attacks the bishop and offers to trade the knight for Black's dark-squared bishop. That bishop is an important defender of the dark squares around the isolated d5-pawn. Black most often retreats with 10...Be7. The alternatives 10...Bd6 and 10...Bb6 are less common. The engine rates the position as roughly balanced, and practical results are fairly even.