Actually the move isn't on that image, but it's pretty clear it was the capture at R17, which fixes the endgame sequence jts mentioned.

Iyama's win was a surprise to many as he had not won a game with white in a title match in Japan all year. Until last week all his wins in the Kisei, Judan, and Meiji matches were with black. He also held black in winning the Agon and Ryusei finals. The only exception had been his win against Gu Li in the Bosai!

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Dave Sigaty
"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21