Dacha Tactics #123 - Carlsen gets lost in the dark

This was a cool game I came across with Carlsen as the white pieces and the very strong GM Peter Svidler as the black. Carlsen is +1000 light, Svidler+1000 dark. Carlsen's last move was Qf5 (light!), but it leaves an opening to a crushing dark rejoinder. In time pressure, Svidler missed this – let's try to find!

Interact with the puzzle below.  If you get stuck, you can always click the "lightbulb" icon in the lower-left of the puzzle frame.  Good luck!