Maestro n° 099 : Page 59 - Gr 56
L6C9 =7= L6C7 -7-8- L6C7 =8= L4C7 -8- L4C5 =8= L5C5 -8-5- L5C5 =5= L6C6 -5-9- L6C6 =9= L8C6 -9-4- L8C6 =4= L8C9 donc L6C9 ≠ 4 et L8C9 ≠ 7