. After this exchange White won't be able to cover both weaknesses at b3 and f4.
Unity Chess Club
Svidler - Motylev Moscow 2004 Black to move
1...Rc1+! 2.Re1
White exploits the exposed position of the bishop on a6 in order to create some activity.
Thus White blocks the passed pawn and creates the threat of a3-a4, whereas Black has a problem with his exposed king. The game continued