Maestro n° 103 : Page 84 - Gr 81
L8C2 =7= L1C2 -7-9- L1C2 =9= L1C6 -9-3- L1C6 =3= L1C9 -3-5- L1C9 =5= L6C9 -5- L6C3 =5= L5C3 -5-1- L5C3 =1= L8C3 donc L8C2 ≠ 1 et L8C3 ≠ 7