Maestro n° 103 : Page 18 - Gr 15
r5c3 -5- r5c5 +4+ r9c8 +7+ r5c3 -7 => r5c79 ≠ 5. The candidates 4 in cells r8c57 used as strong link for the indirect link r5c5 +4+ r9c8 and the candidates 7 in cells r2c38 used as strong link for the indirect link r9c8 +7+ r5c3