6 8 1 9 5 2 7 4 3 6 9 2 6 9 8 7 4 5 6 3 8 7 2 5 6 3 4 1 4 9 2 6 16-04-2017.......hard 16-04-2017 www.daily-sudoku-puzzle.com

6 2 8 4 3 5 1 7 9 9 5 1 2 8 7 6 4 3 3 4 7 6 1 9 5 8 2 2 3 6 9 4 8 7 5 1 7 8 5 1 2 3 9 6 4 1 9 4 5 7 6 3 2 8 8 1 3 7 6 2 4 9 5 5 6 2 3 9 4 8 1 7 4 7 9 8 5 1 2 3 6

2=>(1,2) | 4=>(1,4) | 1=>(2,3) | 9=>(2,1) | 6=>(2,7) | 8=>(9,4) | 6=>(7,5) | 4=>(7,7) | 6=>(5,8) | 3=>(2,9) | 7=>(8,9) | 7=>(1,8) | 4=>(3,2) | 7=>(3,3) | 8=>(2,5) | 1=>(3,5) | 3=>(7,3) | 1=>(5,4) | 9=>(8,5) | 1=>(7,2) | 9=>(7,8) | 7=>(9,2) | 8=>(8,7) | 3=>(9,8) | 3=>(4,2) | 5=>(3,7) | 8=>(3,8) | 3=>(5,6) | 5=>(9,5) | 9=>(6,2) | 1=>(9,6) | 9=>(5,7) | 3=>(1,5) | 5=>(1,6) | 8=>(5,2) | 8=>(6,9) | 2=>(6,8) | 5=>(4,8) | 4=>(5,9) | 7=>(6,5) | 1=>(6,1) | 1=>(4,9) | 2=>(4,1) | 7=>(5,1) | 4=>(4,5) | 2=>(5,5) | 5=>(8,1) | 2=>(8,3) | 5=>(5,3) |