Maestro n° 103 : Page 21 - Gr 18
r9c2 =5= r9c8 -5- r4c8 =5= r5c7 -5-2- r5c7 =2= r5c3 -2-8- r5c3 =8= r7c3 => r7c3 ≠ 5 and r9c2 ≠ 8