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Posts: 13
Location: Germany | I have been wondering at which point the solving turns into guessing, for example if you're using chain strategies and eliminate numbers by that. I always feel like this is also kind of guessing. When do you think is the border between guessing and using a strategy? |
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2021 World Sudoku+Puzzle Convention Organizer
Posts: 1780
   
Location: India | I think this topic's a little subjective. There's certain techniques that come easier to some solvers than others. I agree with Thomas' basic explanation here - http://www.gmpuzzles.com/blog/2013/03/ask-dr-sudoku-12-the-line-mus... (coincidentally posted around the same time as this query). In that explanation he's given the most practical reasoning. Anything a solver can see in his mind without having to put some digits in to reach a contradiction can be called logic. Its just that different solvers may not be able to see the same amount of steps/information as other solvers.
Whether a puzzle is logically solvable and whether a specific person can solve it logically are two different things IMO. As a solver, many times I've had some logic pointed out to me that I missed even after hours of staring. Similarly, as an author I've sometimes had to point out to solvers where/what the logic is to my puzzles too. |
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Posts: 13
Location: Germany | Thank you very much. I hadn't seen this post yet. It helped me very much, although I think it's not that easy to solve the puzzle without guesswork if you're imagination isn't the best and you constantly forget which number you picked to try out. |
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Difference between guessing and solving a sudoku logically
