Maestro n° 102 : Page 81 - Gr 78
L6C7 -6- L5C9 =6=8= L5C9 -8- L8C9 =8= L8C5 -8-3- L8C5 =3= L8C1 -3- L6C1 =3= L6C7 donc L6C7 ≠ 6