Sudoku Solving Techniques

Intermediate Sudoku Solving Techniques Part 3: Solving from Multiple Directions

The Ultimate Sudoku Strategy Guide

Emeritus Professor of Mathematics Jerry Janusz presents a survey, step-by-step, of most of the known techniques used in solving Sudoku puzzles and

Solving Sudoku: Illustrated Strategies

Sudoku Assistant -- Solving Techniques

Techniques to Solve this Sudoku Puzzle - Puzzling Stack Exchange

10 Sudoku Tips and Tricks That'll Help You Solve Faster - Mastering Sudoku

Super Sudoku - Advanced Sudoku Solving Techniques and Tips

Basic Solving Techniques of Sudoku - SudokuMania

The Mathematics Behind Sudoku: Solving Strategy, Article

Sudoku tricks and tips for beginners, by upender garg

Sudoku solver. C recursive implementation (backtracking technique), by Ivan Shelomentsev

Swordfish - Sudoku technique