Back-rank mate pattern.
Learn the back-rank mate pattern, the warning signs that make it work, and the defensive luft moves that prevent it.
What makes a back-rank mate possible?
The king is trapped behind its own pawns and has no flight square, allowing a rook or queen to check along the back rank with no legal escape.
Spot the boxed-in king
Look for a castled king whose three pawns have not moved. If no friendly piece can block and no defender can capture the checking rook or queen, a back-rank check can end the game immediately.
Remove the defender
Many back-rank combinations begin with a deflection. A defender guarding the entry square may be overloaded, pinned, or lured away by a forcing capture.
Create luft before danger arrives
A pawn move such as h3 or h6 can give the king an escape square, often called luft. Make that move when the back-rank threat is real, not automatically in every position.
Practice it on the board
Test your move first, then use Stockfish to compare the strongest continuation.