7 8 1 7 8 9 6 3 5 7 7 8 6 9 3 3 9 4 2 3 5 7 2 1 2 4 7 9 1 21-04-2018.......hard 21-04-2018 www.daily-sudoku-puzzle.com

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

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