Maestro n° 102 : Page 86 - Gr 83
L2C8 -3- L5C8 =3= L5C2 -3- L6C3 =3=6= L6C3 -6- L4C1 =6= L9C1 -6- L9C9 =6=7= L9C9 -7- L2C9 =7= L2C8 donc L2C8 ≠ 3