Maestro n° 103 : Page 86 - Gr 83
AIC Type 1
r8c4 =7=4= r8c4 -4- r3c4 =4= r3c1 -4-1- r3c1 =1= r8c1 -1- r8c9 =1=7= r8c9 => r8c17 ≠ 7
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