Using my CL based sudoku solver [1], I got the following solution. The solution is valid but different from what is shown in the video. IIRC, a sudoku board can have multiple solutions but anyone out here can explain why so? I am no sudoku expert or enjoying solving sudokus anyways!

[1] https://github.com/dmsurti/sudoku

```

(setf board

      #(0 0 0 0 0 0 0 0 0

        0 0 0 0 0 0 0 0 0

        0 0 0 0 0 0 0 0 0

        0 0 0 0 0 0 0 0 0

        0 0 1 0 0 0 0 0 0

        0 0 0 0 0 0 2 0 0

        0 0 0 0 0 0 0 0 0

        0 0 0 0 0 0 0 0 0

        0 0 0 0 0 0 0 0 0))

```

```

* (sudoku:print-board (sudoku:solve board))

1 2 5 | 6 4 7 | 8 9 3

8 3 4 | 5 9 1 | 6 7 2

9 7 6 | 3 2 8 | 4 5 1

- - - - - - - - - - -

5 8 9 | 2 3 4 | 1 6 7

2 6 1 | 7 8 9 | 3 4 5

3 4 7 | 1 5 6 | 2 8 9

- - - - - - - - - - -

4 9 2 | 8 1 5 | 7 3 6

6 1 8 | 9 7 3 | 5 2 4

7 5 3 | 4 6 2 | 9 1 8

```

edit: formatting