Note: The boards are interactive.
Quiet move are often - erm - quiet. But this case white has no good moves so they resigned. Simply by castling black is threatening Ra8+.
-–
Rant
In other news - fuck google. This is the sort of result google should give. Instead I found the link to it in some random comment with zero upvotes and nearly zero context. I clicked the link assuming it would be a waste of time but it turned out to be better than google itself.



Meta: Thanks for Chessposting on here. Rant: Modern 3D graphics are quite terrible for energy efficiency/environmental reasons, chess offers complexity in the 2D plane and can run on a potato PC.
In general we should pay more attention to board games (maybe on computers).