[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "White to play and mate in 12"] [Black "?"] [Result "*"] [Annotator "peter"] [SetUp "1"] [FEN "2k5/1R6/1K6/8/8/8/8/8 w - - 0 1"] [PlyCount "23"] [EventType "team-tourn"] [EventRounds "15"] [SourceVersionDate "2020.04.01"] {[#]} {White to play and mate but the rook can only move once. It's mate in 12 with the best defence.} 1. Ka7 (1. Kc6 Kd8 2. Kc5 Kc8 3. Kb6 Kd8 4. Kc6 Kc8 {leads nowhere}) 1... Kd8 2. Kb8 Ke8 3. Kc8 Kf8 4. Kd8 Kg8 5. Ke8 Kh8 6. Kf7 Kh7 7. Kf6+ Kg8 (7... Kh6 8. Kf5 Kh5 9. Rh7#) (7... Kh8 8. Kg6 Kg8 9. Rb8#) 8. Ke5 (8. Kf5 {is equally good}) 8... Kf8 (8... Kh8 9. Ke6 Kg8 10. Kf6 Kh8 11. Kg6 Kg8 12. Rb8#) 9. Ke6 Kg8 10. Kf6 Kh8 11. Kg6 Kg8 12. Rb8# *