1 3 7 2 6 7 5 5 8 9 8 5 5 2 3 4 7 6 7 2 1 7 4 3 6 2 5 9 12-02-2018.......hard 12-02-2018 www.daily-sudoku-puzzle.com

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

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