Maestro n° 102 : Page 86 - Gr 83
L8C8 -4- L8C6 =4=7= L8C6 -7- L8C4 =7=1= L8C4 -1- L6C4 =1= L6C7 -1- L1C7 =1=3= L1C7 -3- L12C9 =3= L8C9 -3-9- L8C9 =9= L8C8 donc L8C8 ≠ 4