Isinyathelo 16 · Okochwepheshe
XYZ-Wing: liyini leli qhinga? Indlela yokuxazulula i-Killer Sudoku
I-XY-Wing lapho isikwele esiphakathi sinezinombolo ezingenzeka ezintathu (XYZ): ungasusa inombolo abahlanganyela kuyo, u-Z, kunoma yisiphi isikwele esibona esiphakathi nazo zombili ezinye izikwele.
Liyini leli qhinga
Isihlobo se-XY-Wing lapho isikwele esiphakathi sinezinombolo ezingenzeka ezintathu (1, 2, 3). U-A ungu-1 noma ungu-3, kanti u-B ungu-2 noma ungu-3.
Uma esiphakathi singu-1, u-A ungu-3. Uma singu-2, u-B ungu-3. Uma kungenjalo, esiphakathi ngokwaso singu-3.
Esinye kulezi zikwele ezintathu sihlala singu-3, ngakho noma yisiphi isikwele esibona zontathu angeke sibe ngu-3.
Ungalibona kanjani
Qala esikweleni esinezinombolo ezingenzeka ezintathu, bese ufuna izikwele ezimbili esizibonayo, ngasinye sinezimbili zezinombolo zaso.
Isibonelo
Izindawo ezizungezwe ulayini wamachashazi yizibaya, isamba sisekhoneni eliphezulu kwesokunxele. Izikwele eziphuzi zikhombisa ukuthi ubheke kuphi, ezisawolintshi ziyisizathu, izinombolo ezibomvu yizinombolo ezingenzeka ongazisusa, kanti inombolo eluhlaza okotshani iyimpendulo.
Isikwele M2K7 singaba ngu-5, ngu-6 noma ngu-3. Uma singu-5, isikwele M2K3 singu-3; uma singu-6, isikwele M2K2 singu-3; uma kungenjalo, isikwele M2K7 ngokwaso singu-3. Esinye kulezi ezintathu sihlala singu-3, ngakho noma yisiphi isikwele esibona zontathu (M2K5 no-M2K9) angeke sibe ngu-3.