7 4 6 5 8 2 7 4 6 3 9 5 6 7 9 3 9 1 2 4 4 8 2 3 8 9 5 6 21-12-2020.......hard 21-12-2020 www.daily-sudoku-puzzle.com

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

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