Lesson
White to move. Main line: 20. Rxe7+ Nxe7 21. Qxd7+ Kxd7 22. Bf5+ Ke8 23. Bd7+ Kf8 24. Bxe7#
20.Rxe7+! removes the knight that guards the mating squares. After 20...Nxe7, 21.Qxd7+! gives up the queen to place the king on d7.
The bishops take over from there. Bf5+ and Bd7+ drive the king back before Bxe7# closes the net.
Every sacrifice changes the geometry for the next attacker. The combination is a useful model for calculating checks as a connected sequence, not as isolated moves.
The game is Anderssen–Dufresne, Berlin 1852. The name is usually credited to Steinitz, who called it an evergreen in the laurel wreath of the departed chess master, and it remains one of the most reproduced combinations in the literature.