Become a Tactical Beast

Hi guys, my new post is about tactics.

In the exercises below, you will find 17 examples from the Fide World Cup. 
The tests are quite hard but very instructive, some of them were found by the players, but many were missed by the strongest players in the world.
My advice is to think at least 3 minutes on each exercise. Please let me know, in the comments below, how many examples you solve.