Daily Chess Puzzle

Today’s puzzle is a change from the normal, inspired by a tweet by Olimpiu Orcan-see my posting of 7th February 2018.

On an occasional basis I will post a challenge to see if reader’s can spot the games which had particular moves.

Which famous game had   21 Qg7!!   in it?

Ivanchuk v Shirov, Wijk aan Zee 16/1/1996