Here's a beautiful mate from a game with Mikhail Tal (White) vs. Johann Hjartarson (Black), played in Reykjavik in 1987. In the actual game, it was white to move and mate in four from the position below, and Hjartarson resigned one move away from mate.
Don't cheat!
1. Ng4+ disc. ch. Kf7
2. Nh6+ Ke7
3. Ng8+ Kf7
4. Ng5#
Hjartarson could have delayed the checkmate by one move with Qd4, but that would have thrown away any chance he had to make mate in one (Qh1#) in case Tal slipped up and would have sacrificed a queen for nothing, because after Qxd4+ the mating threat resumes.