8 7 6 2 3 5 8 1 4 1 1 5 4 9 3 2 5 6 9 5 7 3 2 9 2 7 4 8 18-09-2017.......hard 18-09-2017 www.daily-sudoku-puzzle.com

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

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