[NOTE: This is Volume 3 of a four-volume set; each volume must be purchased separately.]

"Unlocking Sudoku: The Art of Seeing the Logic"
Volume 3: Advanced Chains and Grandmaster Theory (This Book)

This "how-to" four-volume workbook series is not a collection of mere "tricks" or "shortcuts." Instead, it meets the puzzle on its own terms by providing comprehensive, clear, and patient education in every logical concept and technique needed to solve even the most challenging Sudoku puzzles.

"Unlocking Sudoku: The Art of Seeing the Logic", the series, contains over 1,000 pages of instruction, 40+ dedicated technique chapters, hundreds of large real world example puzzles with concise explanations, and a variety of FAQs after each chapter to further solidify what you just learned. It also features a comprehensive assessment quiz with each chapter that gauges your knowledge of the technique studied. All of this supports the entire learning cycle, from initial discovery to practical application.

We spent many hours deconstructing thousands of Sudokus, from beginner to expert level (and beyond), to ensure we provide engaging, cogent, and thorough explanations for all the essential solving strategies.

Online Support Access: We realize that sometimes there are situations where you just get stuck. You may not see that Swordfish, or X-Wing. That's why we invite you to visit our community site, which we launched, where you can get answers when you're stuck at no extra charge. Our online support is here to ensure you never feel alone in your Sudoku journey.

Series Structure: Each volume in the series contains chapters with clear technique explanations, FAQs, chapter reviews, and chapter assessment quizzes.

Volume 3: Advanced Chains and Grandmaster Theory (This Book) contains the following chapters:

Part 1:  The Concept of Chains: Following a Trail of Cause and Effect
CHAPTER 1: Using a Simple Chain to Find Remote Pairs
CHAPTER 2: Using Bi-value Cells to Spot Chute Remote Pairs
CHAPTER 3: Understanding Simple Coloring Logic
CHAPTER 4: Executing Advanced Chains with a W-Wing
CHAPTER 5: Use X-Chains and X-Cycles to Open a Stubborn Grid
CHAPTER 6: Following the Flow of Logic with an XY-Chain

Part 2:  Grandmaster Theory - The Unifying Principles
CHAPTER 7: Demystifying Almost Locked Set (ALS)
CHAPTER 8: Unleashing the Power of Sue de Coq (SDC)
CHAPTER 9: Understanding Aligned Pair Exclusion (APE)
CHAPTER 10: Using Multi-Coloring to Discover Eliminations
CHAPTER 11: Using 3D-Medusa to Unlock the 3rd Dimension
CHAPTER 12: Nice Loops: Working With Closed Chains
CHAPTER 13: Building an Alternating Inference Chain (AIC)