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09 March 2012 @ 12:02 am
Friday Puzzle #141 - The Art of Sudoku - Sample #2  
This past weekend I finished constructing all the puzzles in my forthcoming classic sudoku book: The Art of Sudoku. I now have a first draft of the book laid out, but still need to check some timings, make cover art, and do other small fixes. But my Spring target will certainly be met. I wanted to share another sample puzzle from this book (see here for Sample #1).

One new trick I've been using recently in constructing is something I learned from creating Just One Cell Sudoku. Basically, the steps you take to hide a very clean logical deduction that only gives one new cell can be used for a whole puzzle provided you are very careful that no easier moves are possible and can work backwards from that cool state. This week's sample is one of the harder puzzles in the book, but hopefully showcases what a good handcrafted puzzle can feel like at the higher difficulty levels.

Rules: Place a single digit from 1 to 9 into each cell so that no digit repeats in any row, column, or bold 3x3 region.



Solution
 
 
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motrismotris on March 10th, 2012 04:35 am (UTC)
Spoiler: So the puzzle is built around getting a digit in R1C8. Everything that comes after that digit is just an 81-cell solution. In the old format, R1C8 would have been the answer.