Maestro n° 103 : Page 75 - Gr 72
r8c2 =5= r2c2 -5- r2c8 =5= r3c9 -5-9- r3c9 =9= r9c9 -9-8- r9c9 =8= r8c8 => r8c8 ≠ 5 and r8c2 ≠ 8