Sudoku Medium 2

The second Sudoku puzzle is partially filled. The visible numbers are: 1, 8, 6; 8, 9, 6, 7; 4, 1, 2, 6; 5, 7, 9, 1, 6; 3, 9, 2, 1, 7; 6, 8, 5, 3; 2, 4, 1; 4, 2, 3; 8, 6, 9, 5.