Stop Scholar's Mate
Black to move. Stop the mate and hit the queen.
Snort's queen and bishop are aiming at f7. Block the queen and kick it.
Hint
Which pawn can block the queen and kick it?
Answer
g6 — Defended! g6 kicks the queen and f7 is safe.
The tempting mistake
Knight to f6 attacks the queen — but queen takes f7 is mate. That's the trap!
The idea
When queen + bishop aim at f7, block with a pawn that also attacks the queen.
This defense 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.