Chess in 40 SecondsThe Fishing Pole Trap
Black to move. Mate in 1.
Snort took the bait and opened the h-column. Mate him.
Hint
The column on the right edge is open now.
Answer
Qh2# — Checkmate! The pawn on g3 guards the queen.
The idea
Opening a column next to your own king is dangerous. The knight was the bait, the h-column the hook.
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.