← Sudoku Strategies

# Sudoku: Backtracking Strategy and Techniques

Backtracking is a common technique used in solving Sudoku puzzles when other strategies fail. It involves making educated guesses, checking for contradictions, and backtracking when necessary. Here’s an example of how you can use the Backtracking technique to solve a Sudoku puzzle:

1. Begin by selecting an empty square in the puzzle grid.
2. Make an educated guess by assigning a candidate number to the selected square based on the current state of the puzzle.
3. Check if the assigned number violates any Sudoku rules, such as duplicating a number in the same row, column, or box.
4. If a contradiction is found, go back to the previous square where the guess was made and try a different number.
5. If no contradiction occurs, continue solving the puzzle using other strategies and techniques.
6. Repeat steps 1-5 until all squares are filled and the puzzle is solved or until all possible guesses lead to contradictions.

Remember that Backtracking involves systematically exploring different possibilities until a valid solution is found. It may require multiple backtracks and trial-and-error before reaching a solution.

To effectively use Backtracking, it’s recommended to combine it with other logical deductions and advanced solving techniques. These techniques help reduce the need for extensive guessing and backtracking.

With practice and patience, you can become proficient at using Backtracking to solve even challenging Sudoku puzzles that seem unsolvable using logic alone.

## Sudoku Solver

If you get really stuck then we have an online Sudoku Solver, and a Sudoku Mini Solver to help you solve the most challenging Sudoku puzzles.