I am writing a tkinter app and is using threads for performance (computing-intensive tasks)

I have read multiple similar questions & answers, but somehow still have not understood how to apply them to my particular use case. The best I found was using Tkinter with Thread:

I am triying to write sudoku solver. This is really complicated code for me. I want to update board while python calculating other things. However, code could not do that. Should I try threading or is there easy way to do that?