7 2 1 6 5 3 3 9 8 5 3 4 6 2 9 2 8 7 1 6 3 7 5 4 8 2 5 4 23-11-2017.......hard 23-11-2017 www.daily-sudoku-puzzle.com

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

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