Sudoku Suprême n° 040 : Page 61 - Gr 58
L2C9 =1= L2C1 -1- L3C2 =1= L8C2 -1-8- L8C2 =8= L8C7 -8- L1C7 =8= L1C8 -8-3- L1C8 =3= L3C8 -3-1- L3C8 =1= L7C8 donc L3C8 et L7C9 ≠ 1