Maestro n° 103 : Page 52 - Gr 49
L1C6 =7= L1C8 -7-6- L1C8 =6= L8C8 -6-1- L8C8 =1= L8C2 -1- L2C2 =1= L2C6 donc L1C6 ≠ 1 et L2C6 ≠ 7