I loved the small combos - Qxc8 rather than N, b6 with nice geometrics all over the place, and finally stealing on f7, just in the nick of time
Caruana's king play in this game, intruding on white squares and heading to the Q-side, and his flexibility in the use of the rook in search of weak zones to enter - first on the left, then on the right, are masterful and most instructive.
It's definitely not easy to play and win such endgames, against tough resistence, up the exchange with so few pawns.
Especially the rook maneuvers speak of untold patience, optimism and belief in the strength of his position. A lesson!
Caruana retires his R from d5, then mobilizes the k-side pawns and K to create a supportive post for his rook on e5. It's not clear what he's doing there, but for now he's just squeezing his opponent.
It's noteworthy how he goes about, methodically threatening the minor pieces to make the black knight retreat to the back line... progress is made in small, gradual steps.
next he retreats again, and heads for the king side, this time for the decisive invasion - and everything is calculated so precisely! I loved it