Tactics & checkmates
Back-rank mate
In a back-rank mate, a rook or queen checkmates a king on its home rank. Friendly pawns often block the escape squares. The motif creates tactical threats well before mate because defenders may be tied to the back rank.
A practical example
The black king is on g8 with pawns on f7, g7 and h7. A white rook on e8 attacks along the eighth rank. With no capture, block or escape available, Black is checkmated.
A common mistake
Automatically making a pawn move for luft. It may create an escape square but also open a dangerous diagonal. Conversely, a check on the back rank is not necessarily mate.
Try this in your next review
Test all three defences: capture the attacker, block the check and move the king. When none works, it is mate. During rook exchanges, notice which back-rank defender disappears.