White to play and win.
There are many ways to win but all involve the theme of pawn breakthroughs (see our article on King & Pawn Endgames) and 2 passed pawns. White can always deal with the Black passed pawn on d4. In the game, Capablanca played 39. b4! axb4 40. a5 Kc7 and then created a passed pawn on the Kingside with 41. g5 fxg5 42. fxg5 hxg5 43. hxg5 b3 44. Kd3 Kd7 45. g6 fxg6 46. fxg6 1-0