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Sudoku Explained
by Giulio Zambon

ISBN: 978-1481829298
Publisher: Self-published with CreateSpace on 2013-01-09. Pages: 98.
Available on Amazon for USD 9.49 in print

ISBN: 978-1-4477-3693-6
Publisher: Self-published with Lulu on 2011-05-29. Pages: 94.
Available on Lulu for USD 4.99 in PDF format

ISBN: 978-1-4661-7061-2
Publisher: Self-published with Smashwords on 2011-11-08.
Available on Smashwords for USD 0.99 in several formats

After reading this book, you will be able to solve most Sudokus, including those classified as diabolical, as long as they can be solved analytically.

What follows is the Introduction section from the book.

Introduction

Welcome to Sudoku Explained. The purpose of this book is to help you become a Sudoku champion. Not everyone has the pattern-recognition abilities to become a champion, and I cannot guarantee that you will succeed, but I can point you in the right direction. The rest is up to you.

The WorldWide Web is full of explanations about Sudoku. You can find the description of many strategies and lots of examples. What I believe you will only find in this book is a systematic and consistent description of all significant strategies coupled with commented solutions of puzzles.

For this book, I have chosen forty Sudokus I generated with the program described in my first Sudoku book ( Sudoku Programming). They all have thirty-three clues and look like medieval crosses, because the central row and the central column are always already solved.

Their difficulties range from easy to diabolical, measured as the number and complexity of the solving strategies they require. It is true that, in general, puzzles with fewer clues are easier, but what is true statistically, doesn't apply to each individual puzzle. I have seen very easy puzzles with only seventeen clues, while the last puzzles in this book, despite their thirty-three clues, are as challenging as they come.

Chapter 1 describes the terminology I use throughout the book.
Chapter 2 explains in detail fifteen strategies grouped in four levels of complexity, from 0 to 3.
Chapter 3 presents the Sudokus. Puzzles 1 to 10 can be solved with level 0 strategies; 11 to 20 require level 1 strategies; 21 to 30 are at level 2, and 31 to 40 are at level 3.
Chapter 4 provides the solutions of the puzzles shown in Chapter 3. For the puzzles at level 1, I also list a sequence of strategies capable of solving them, while for the puzzles at level 2 and 3, I explain the application of the more complex strategies in detail.

Have fun with Sudoku!

Back-cover blurb

This book tells you in a very practical way how to solve Sudoku puzzles.

First, it describes in detail and with examples fourteen solving strategies, from the very simple to the very complex.

Then, it explains how to apply the strategies you have learned to forty puzzles of increasing levels of difficulty.

No other book will teach you how to solve Sudoku puzzles as effectively as this one, but be warned: after reading it, you will discover that the puzzles in your local paper are not so challenging after all!

Example of how I describe a strategy

naked pair

Example of how I explain a solution in detail

detailed explanation

Example of how I describe the application of a complex strategy

applying a complex strategy

History

To write my first book on Sudoku, Sudoku Programming, I developed programs to generate and solve a practically unlimited number of Sudokus.

The beauty of having a Generator and a Solver is that you can pick and choose Sudoku puzzles on the basis of the complexity of their solutions. This gave me the idea of writing a booklet with guided solutions. It is something that you seldom find on the Web or in print. At best, you only find an example or two. I thought: wouldn't it be useful to collect in a single booklet several examples of how to apply the more difficult strategies?

Sudoku Explained is the result of that effort.