4 8 2 3 6 9 4 2 1 6 5 8 9 4 7 1 8 6 9 4 6 2 9 1 3 2 8 7 5 3 20-06-2017.......hard 20-06-2017 www.daily-sudoku-puzzle.com

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

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