White to play and win
Petrosian v Spassky, World Championship, game 10, 1966
Solution
Part of my chess culture. I recognised this position, and knew where it was from, and, of course, the solution.
1 Bf7+ Rf7 (1…Kf8 2 Qh8+ Ke7 3 Nef5+ Kd7 4 Qc8 mate) 2 Qh8+! and Nf7+ forking follows.