Maestro n° 103 : Page 50 - Gr 47
L5C8 -6- L5C2 =6=1= L5C2 -1- L1C2 =1= L1C9 -1- L2C7 =1= L8C7 -1-6- L8C7 =6= L8C8 -6- L5C8 donc L5C8 ≠ 6