Bibliography
Brian Hayes www.americanscientist.org/template/AssetDetail/assetid/48550
Excellent survey article; bibliography.
Excerpt: But if you are trying to gain a higher-level understanding of Sudoku,
compiling a catalog of such techniques doesn't seem very promising. The rules
are too many, too various and too specialized.
The World Chamionship Sudoku Match
in March of 2006.
"The New York Times", May 1, 2006.
Poughkeepsie Journal
This is a wonderful source for puzzles. Monday's is easy.
They get harder throughout the week. Friday, Saturday, and
Sunday are tough.
Pete Sinden "The Essential Book of Sudoku". Atria Books.
New York, 2005.
No explanation here, just 201 puzzles. The puzzles are
divided into five levels of difficulty. I could find
nothing to distinguish the various levels. The program
solved all 201 puzzles, without human assistance, in just
a few seconds. One puzzle went 9 iterations; 2 went 8;
all others were less. The main attraction of the puzzles
in this book is their geometric layout.
Robin Wilson. "How to Solve Sudoku - A Step-by-Step Guide"
Sterling Publishing Company, Inc. New York,
2005
The author is apparently an established mathematician, but
there are few ideas in this book. Instead there are many,
many detailed examples. I found it instructive to work
through some of the examples, tiresome to work though
them all.