1 6 7 8 9 6 2 3 2 1 4 8 5 9 2 5 9 9 6 5 7 7 4 5 1 4 3 8 20-09-2017.......hard 20-09-2017 www.daily-sudoku-puzzle.com

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

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