Here is GM Rapport’s Rd4 game.

Rapport,R (2621) – Movsesian,S (2688)
Slav Slow 4..a6[D10]
75th Tata Steel GpB Wijk aan Zee NED (4.4), 15.01.2013

Position 1
There is a massive central confrontation happening. What should white do now?

White to Play