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Enigma Scientific Publishing
Popular Science ebooks and print books
Sample: Sudoku Seventeen by John Austin
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Sudoku Seventeen, by John Austin

This is a combined puzzle and instruction book and is now available in print form, with the ebook now published. It follows on from the "World of Sudoku" with links to stores below.

Sudoku Seventeen cover page
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Obtain print book from CreateSpace.com

Most newspaper and magazine sudoku puzzles have typically 23-25 poles or clues in the initial grid. Recently, however, it has been demonstrated that there must be at least 17 poles for a unique solution. Such puzzles have their own characteristics and are amenable to particular solution methods. You might expect, then, that puzzles with only 17 poles will be particularly challenging. This book is a collection of puzzles with a demonstration of how to solve them. World of Sudoku gave one 17-pole Sudoku in Chapter 8 as shown here.



The solution in Chapter 14 was (click here to reveal)

"Sudoku Seventeen" explains how to solve the puzzles and goes on to supply over 200 puzzles varying from moderately difficult to extremely difficult. In addition, the puzzle which was once known as the "World's most difficult Sudoku puzzle" is given, with some hints as to how it can be solved. The solution is also supplied for those who find the puzzle only too challenging!

Website revised by John Austin, 30/10/2015. © Enigma Scientific Publishing, 2015.