Maestro n° 103 : Page 52 - Gr 49
r1c6 =7= r1c8 -7-6- r1c8 =6= r8c8 -6-1- r8c8 =1= r8c2 -1- r2c2 =1= r2c6 => r1c6 ≠ 1 and r2c6 ≠ 7