Maestro n° 103 : Page 24 - Gr 21
r4c3 =8= r6c3 -8-4- r6c3 =4= r6c7 -4-7- r6c7 =7= r4c7 -7-6- r4c7 =6= r4c2 -6-3- r4c2 =3= r4c9 -3- r6c9 =3=8= r6c9 => r4c9 et r6c3 ≠ 8