Maestro n° 097 : Page 86 - Gr 83
L1C1 -6- L8C1 =6=8= L8C1 -8- L8C5 =8= L1C5 -8-3- L1C5 =3= L1C4 -3-7- L1C4 =7= L1C1 donc L1C1 ≠ 6