Sudoku Suprême n° 039 : Page 82 - Gr 79
L6C8 -7- L8C8 =7= L8C1 -7- L7C1 =7=6= L7C1 -6- L3C1 =6= L3C9 -6- L9C9 =6=3= L9C9 -3- L9C8 =3= L6C8 donc L6C8 ≠ 7