Virtuose n° 130 : Page 82 - Gr 79
L1C2 -3- L1C9 =3=2= L1C9 -2- L1C7 =2= L8C7 -2- L8C1 =2=7= L8C1 -7- L8C2 =7= L1C2 donc L1C2 ≠ 3