Sudoku Variants Series (290) - Product Ltd Sudoku
(Published on 14. October 2020, 00:00 by Richard)
Product Ltd Sudoku
Inspiration for this type comes from BoaConstructor.
Solve online in Penpa (Thx SudokuExplorer) or in F-Puzzles (Thx glum_hippo!)
Apply classic sudoku rules.
Clues outside the grid indicate how many times the product of digits in two adjacent cells in the respective row or column exceeds 31.
Solution code: Row 9, followed by column 4.
Comments
on 20. November 2021, 16:25 by Richard
Added link for online solving. Thx SudokuExplorer and glum_hippo!
on 13. November 2021, 05:38 by Nick Smirnov
@Richard, sorry, but I am still not sure what does 'exceeds 31' mean. Is it strict or slack inequality, in other words can these products be 31 or not?
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Hi Nick, exceeds is 'more than', but since 31 is a prime number, the products that we are looking for here are minimal 32 anyway.
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@Richard, thanks. I'm feeling slightly embarassed that I didn't think about 31 being a prime number (facepalm).
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By the looks of it you have still forgotten to enter the solution code! ;-)
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@Richard, no way I would forget to enter the solution code for my first 5-star puzzle :) It took me a lot of effort to tackle this one.
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@Nick: Congratulations! Up to the next one!
Slowly closing the gap...
on 29. November 2020, 09:31 by Richard
Fixed the greater / greater than 30 issue. Thx HaSe.
on 26. October 2020, 07:55 by ibag
Great fun!
on 16. October 2020, 20:02 by chickenspeed19
Loved the puzzle! There isn't really ambiguity because "exceed" is strict inequality, but to completely foreclose the possibility of misunderstanding, you could also phrase the rule as exceeds 31.
on 14. October 2020, 19:31 by Realshaggy
Definitely one of the hardest of the series.
on 14. October 2020, 15:05 by SudokuExplorer
Wonderful! The logic was more challenging, but it helped to treat it like a hidden whispers sudoku (where you need to draw in the whispers (line between orthogonal cells with large products)).
Here's a penpa+ link: https://tinyurl.com/y35s3z87
If anyone wants to try a hidden whispers sudoku, take a look at the puzzle with id=0003XL
on 14. October 2020, 14:38 by glum_hippo
f-puzzles link: https://f-puzzles.com/?id=yygznvey
on 14. October 2020, 13:08 by Richard
@marcmees: thanks for the feedback, but T&E is absolutely not necessary! This puzzle can be solved by logic alone.
on 14. October 2020, 13:05 by marcmees
Bedankt ... wel niet zo eenvoudig. Ik beken dat ik op een bepaald punt ben moeten overgaan op een T&E.
Ik twijfel er niet aan dat er een logische weg is ... maar ik ben die even kwijtgeraakt. Het is me hopelijk vergeven.
on 14. October 2020, 03:02 by cdwg2000
Very good, difficulty may be 4 stars
