Maestro n° 103 : Page 30 - Gr 27
r1c8 =2= r1c5 -2-5- r1c5 =5= r9c5 -5- r7c4 =5=6= r7c4 -6- r8c4 =6= r8c8 => r8c8 ≠ 2 and r1c8 ≠ 6