This week, we hit a major milestone: our solver can now complete very easy Sudoku puzzles, thanks to the simplest rule of all — the single candidate rule. By writing code that parses the grid repeatedly and looks for opportunities to apply this rule, we’re able to solve some of the simplest …

This week we have a new topic for this blog, which is Unit Testing. While not as exciting as actually writing the functional code for a project, it is an important skill to have. By writing tests for your code, you get to check that it behaves the way you intended. Not only does this let you fix the …

This is the update post, a week after planning to build a Sudoku puzzle solver in Python. In this post, we’ll review the direction the project is going and discuss the setup steps involved in this new project.

If you like this post and you’d like to know more about how to plan and write …

Sudoku is one of those puzzles that captivates anyone who attempts to solve it. Sudoku puzzles can range from very easy to fiendishly difficult, despite the rules being relatively simple and unchanging.

To be valid, a Sudoku puzzle must have only a single solution — and this constraint actually …