Isinyathelo 12 · Okochwepheshe
Rule of 45 (imigqa noma amakholomu amaningi): liyini leli qhinga? Indlela yokuxazulula i-Killer Sudoku
Lisebenzisa umthetho wama-45 emigqeni noma emakholomu amabili noma amathathu angumakhelwane (noma emabhokisini amabili) ngesikhathi esisodwa – u-90 kwemibili, u-135 kwemithathu – lisuse izibaya ezingena ngaphakathi.
Liyini leli qhinga
Sebenzisa umthetho wama-45 emigqeni (noma emakholomini) emibili noma emithathu engumakhelwane, noma emabhokisini amabili angumakhelwane, ngesikhathi esisodwa. Imigqa emibili inesamba esingu-90, emithathu esingu-135.
Uma izibaya ziphumela ngaphandle komugqa owodwa, ukuthatha imigqa emibili ndawonye kuvame ukwenza izibaya eziningi zingene ngokuphelele, kusale izikwele ezimbalwa kuphela okufanele zibalwe.
Ungalibona kanjani
Funa izibaya ezisemigqeni (noma emakholomini) emibili. Zithathe zombili ndawonye bese ususa ku-90 izibaya ezingena ngaphakathi.
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.
Umugqa ngamunye, ikholomu ngayinye nebhokisi ngalinye kunezinombolo 1–9 kanye kanye, ngakho izinombolo emigqeni 7, 8 no-9 zinesamba esingu-135. Izibaya ezingu-8 ezingaphakathi ngokuphelele zinesamba esingu-128, ngakho izikwele ezisele (M7K1 no-M7K9) zinesamba esingu-7 (135 − 128 = 7). Esikweleni M7K1 sekukhona inombolo 6, ngakho isikwele M7K9 kufanele sibe ngu-1. Kusala isikwele esisodwa kuphela, ngakho isikwele M7K9 singu-1.
→ Isikwele M7K9 singu-1.