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Glad you fixed it. Sounds like you have a good teacher.

Backtracking would typically be a break from the normal recursive solver method, a reset of the recursive solver. Your backtracking implementation has nothing to do with your understanding of...

The number of rows can be increased to 9 with a keystroke or two. I limited it (scaled it) to 2 to simplify the problem and in case the recursion was getting lost as the problem became more...

Okay. Your additional explanation verified that you were trying to do what I thought you were.

It helps to build a program that can be scaled and provides feedback instead of ending with no...

Then I don't understand what you're trying to do.

Great post!

I don't quite understand your objective, because there isn't a Sudoku puzzle I've seen that starts with 81 empty squares. So instead of trying to find all possible solutions, I think...