4 3 9 8 6 4 2 1 9 3 1 5 2 4 7 5 9 8 1 3 7 6 2 3 4 5 2 3 15-07-2017.......hard 15-07-2017 www.daily-sudoku-puzzle.com

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