Maestro n° 103 : Page 74 - Gr 71
L6C5 -3- L7C5 =3=6= L7C5 -6- L7C3 =6= L5C3 -6- L5C9 =6=7= L5C9 -7- L5C5 =7= L6C5 donc L6C5 ≠ 3