grandmaitre n° 17 : Page 63 - Grille 50
L6C3 =9= L6C7 -9- L4C9 =9=7= L4C9 -7- L4C8 =7= L9C8 -7- L8C7 =7= L8C2 -7-5- L8C2 =5= L8C8 -5-9- L8C8 =9= L8C1 donc L45C1 et L7C3 ≠ 9