Maestro n° 103 : Page 31 - Gr 28
r8c8 =3= r8c6 -3-4- r8c6 =4= r8c4 -4- r2c4 =4=8= r2c4 -8- r2c3 =8= r3c3 -8-1- r3c3 =1= r3c2 -1- r9c2 =1= r9c8 => r8c8 ≠ 1 and r9c8 ≠ 3