Analysis Time

Here's a tweet from FM Carsten Hansen.

Zivkovic-Kurajica
Teslic 2006
White to move
White played 21.Rd2 and draw agreed - White can play another move to win. #chess #schach pic.twitter.com/guPQUv610D

— Carsten Hansen (@CazHansen) August 27, 2017

The first two or three moves suggest themselves. Then it gets harder. Add your analysis in the comments, and I'll post the correct line later.

ANALYSIS can be found here.