Find K+R vs K endgame positions from real Lichess games. The fundamental rook-checkmate pattern every chess player learns — and one of the most reached in practice.
King and rook against a lone king is the second elementary mate, slightly trickier than K+Q. The winning method uses the rook to cut off ranks (or files) while the kings perform "opposition" — facing each other a square apart — to drive the defender to the edge. The mate appears constantly in real games as a final phase of rook endgames, and being able to deliver it quickly under time pressure is a basic competitive skill.