Maestro n° 087 : Page 82 - Gr 79
L9C8 -6- L9C2 =6= L8C2 -6-7- L8C2 =7= L8C9 -7- L9C7 =7=9= L9C7 -9- L7C7 =9=1= L7C7 -1- L7C8 =1=6= L7C8 -6- L9C8 donc L9C8 ≠ 6