The Fried Liver Attack
White to move. Find the knight sacrifice.
Snort took back on d5. His king's shelter has a weak spot. Find it.
Hint
The weakest square near his king is f7.
Answer
Nxf7 — Nxf7! The king has to come out, and White attacks with everything.
The idea
Knight takes f7 drags the king out — then every piece joins the attack.
This chess trap is one of 30 quick puzzles in the Chess in 40 Seconds trainer: find the move on the board, get a hint if you're stuck, and learn the idea so you never fall for it in your own games.