3 5 1 9 6 7 5 2 6 3 1 9 8 7 9 1 4 7 6 2 1 3 8 7 8 4 7 1 3 2 20-07-2017.......hard 20-07-2017 www.daily-sudoku-puzzle.com

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

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