This document describes an approach for solving Sudoku puzzles through a step-by-step process of improving an initial brute force solver. It begins with a simple representation of Sudoku grids and validity checking, then introduces techniques to prune invalid choices, collapse partial grids, and expand single choices to iteratively reduce the search space. The final solver uses these techniques to efficiently solve any newspaper Sudoku puzzle instantly by avoiding blocked states that cannot lead to a solution.
This document describes an approach for solving Sudoku puzzles through a step-by-step process of improving an initial brute force solver. It begins with a simple representation of Sudoku grids and validity checking, then introduces techniques to prune invalid choices, collapse partial grids, and expand single choices to iteratively reduce the search space. The final solver uses these techniques to efficiently solve any newspaper Sudoku puzzle instantly by avoiding blocked states that cannot lead to a solution.
