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NoticeI am no longer posting new puzzles to this blog. For all of my Sudoku puzzles, old and new, please visit Sudoku in another section of this website. I will still create and offer new puzzles, in batches of a couple of hundred, once a week or so. Sudoku #15Category: Sudoku If you're new to this blog, you might be wondering what it's all about. First, a blog is a great way to expose your ideas, wonderful or crazy, to the wider world. Why Sudoku? A couple of weeks ago, the Toronto Star started including a daily Sudoku puzzle. Being a puzzle fan, of course I had to try it. Although I got bored with it quickly, I did get interested in solving Sudoku by computer. Using Python, I had a working program done pretty quickly. I then realized that the program could also be used to create Sudoku puzzles. All I had to do was randomly add values to an initially empty 9x9 grid, and then try to solve it. It was also easy to keep track of which specific solving methods were needed to solve a puzzle. These metrics could be used to determine the relative difficulty of a particular puzzle. With these tools in place, I decided to take the most difficult puzzles produced by my program, and offer them up to the Sudoku world. Every so often, perhaps a couple of times a week, I'll upload a new puzzle, along with some commentary. I may comment on the particular puzzle, or on Sudoku in general. Or I may comment on something else entirely. It's my blog, and I'll do what I want. Anyways, I do hope you find these puzzles either a source of enjoyment, or an exercise in frustration. Todays puzzle should be a bit easier. Next time, I'll discuss another advanced solving technique. Hans
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