Exploiting the opponent's weak back rank, White delivers an immediate and decisive checkmate with the rook.
In this classic endgame position, Black's king is severely restricted by its own pawn shield and lacks flight squares. Recognizing the fatal back-rank weakness, White seizes the initiative by penetrating directly to the 8th rank with the rook on d1-d8. Because the Black king is trapped behind its own pawns with no defensive interposition possible, this single move seals an instant victory. This position serves as an essential tactical lesson on recognizing and punishing back-rank vulnerabilities.