Morphy-Jefferson, New York simul, 1859. This game ends with the mating pattern know as Philidor's Legacy. Morphy sets it up with two Deflection moves. To help learn this pattern and solidify it, practice going over the final moves in your head from move 19. Qa3+ to the end. Once you learn the pattern or if you already know it, go over the game in your head from move 17. e5! onwards to practice your visualization skills.
Deflection is forcing an enemy piece away from some useful position. In this game Morphy deflects the black queen off of the d8-h4 diagonal.
Decoying is attracting an enemy piece to a square useful for you. In this game as part of the final mating pattern, a black rook is decoyed to the f8 square.