[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "White to play and win"] [Black "?"] [Result "*"] [Annotator "peter"] [SetUp "1"] [FEN "8/5k2/7P/6K1/1N6/p7/8/8 w - - 0 1"] [PlyCount "15"] [EventDate "1988.06.??"] [EventType "tourn"] [EventRounds "15"] [EventCategory "15"] [SourceVersionDate "2020.04.01"] {[#]} 1. Na2 Kf8 {the best defence, deferring mate for as long as possible and giving White a chance to go wrong} (1... Kg8 2. Kg6 {transposing to the mainline}) 2. Kf6 $1 (2. Kg6 {only draws} Kg8 3. Nb4 Kh8 {now h7 is not check, which costs White a vital tempo.}) 2... Kg8 3. Kg6 Kh8 4. Nb4 (4. Nc1 {leads back to the mainline}) (4. Nc3 {leads back to the mainline}) 4... Kg8 (4... a2 5. Nxa2 Kg8 6. Nc3 Kh8 7. Ne4 Kg8 8. Ng5 Kh8 9. Nf7+ Kg8 10. h7+ Kf8 11. h8=Q+ Ke7 12. Qd8+ Ke6 13. Qd6#) 5. h7+ Kh8 6. Nc6 a2 7. Ne5 a1=Q 8. Nf7# *