Maestro n° 094 : Page 79 - Gr 76
L2C1 -6- L2C8 =6= L1C8 -6-1- L1C8 =1= L9C8 -1- L7C9 =1=5= L7C9 -5- L7C1 =5= L2C1 donc L2C1 ≠ 6