One of my coworkers pointed me at The Daily Sudoku. I’ve tried and enjoyed a few; I’m not sure how long I’ll keep it up, but I’m not stopping yet. So far I’ve only tried ones rated easy or medium (and, honestly, I can’t tell the difference between the two levels); apparently the hard rated ones are a significant change. I’ll be curious to see if they make me think in interesting ways, or if they just make me go through long tedious searches to make progress. (I tried to order the book from the site – it seems clearly worth two pounds, but I ran into some strange paypal glitch. Sigh. I thought this electronic payment stuff was supposed to work well by now?)
It reminds me of some other puzzle, but I can’t think of what. The common idea is this: say you have boxes where the choices for each box are 12, 12, 1234, 1234. Then you know that the first two boxes use up 1 and 2, even if you don’t know the order, so you can reduce the choices to 12, 12, 34, 34. Where else is this idea important?
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