





'The Logic of Sudoku' Resources Page Introduction Welcome to the "Logic of Sudoku" resource page. To start with I have listed the exercises in the book with links to printable versions  in case you'd like to print them out instead of working in the book. The second set of links are to my Step by Step solver for some of the puzzles and exercises in the book. This, I hope, will allow you to see the examples as the come about. In some cases some strategies might need to be turned off to allow the example to find the use of a particular strategy, but in most cases I have picked examples for the book that are necessary steps. Any feedback or comments always appreciated. Andrew Stuart
Printable Exercises
The following are the exercise puzzles in the book. You can click on the links to get a printable version of each puzzle.
Corrections Hidden Pairs  page 20 The sentence immediately under the diagram should read "1 and 5 occur in only two cells in box 2, but they are hidden by the 3 and 8 in C4 and the 3/7/8 in C6". Also the diagram 6.2 should show 1/5 in C4/C6, not 5/8. Exercise 3  Hidden Pairs There is a small error on the exercise answer. One of the Hidden Pairs has been incorrectly highlighted. The fifth one, the {3/9} in box six is the correct Hidden Pair, not the {3/9} in box 8. Figure 22.2 on page 63 Unfortunately Figure 12.2 was substituted in place of the actual figure for 22.2. The real diagram is: Table on page 123 The Extended Aligned Pair table on page 123 doesn't contain the strikethroughs which remove certain pair combinations and show how 3 can be removed. The corrected table is: Table on page 183 In the chapter 44, Killer strategies, is the list of cages with a unique combination of numbers. The correct table is here: Note: Cages of size 7 were not included since they do not appear in most Killer Sudoku puzzles, but 41 = 2/4/5/6/7/8/9 42 = 3/4/5/6/7/8/9 A full list of all combinations is here: /Killer_Combinations. If anyone wishes to comment, correct or contribute to these pages please feel free to contact me at andrew@sudokuwiki.org. I'm always interested to hear from other Sudoku fanatics. Andrew Stuart Exercise 5  Simple Chain / ColouringI've received some emails about the difference between the solver and the solution published as exercise 5 in the book. This diagram to the right is currently how the solver sees the situation.

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