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stuck in this sudoku
   LMI Essentials -> Solving Techniques159 posts • Page 7 of 7 • 1 2 3 4 5 6 7
kishy72
Subject: Re: stuck in this sudoku @ 2019-11-23 12:36 PM (#27362 - in reply to #8611) (#27362) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India		Little Killer from LMD portal by 'Realshaggy'

This sudoku is pure evil.I tried everything that I usually encounter in Little Killer Sudokus from totalling clues,seeing min-max possibilities, clue interaction etc., but this sudoku just yielded nothing.I have been trying for the past week or so to complete this without success.It's kind of demotivating in a way that after so many years of solving sudoku, there are still some that I am unable to be complete. Kindly someone share the break-in for this ' psycho little killer '.



(LK.jpg)



Attachments
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Attachments LK.jpg (45KB - 2 downloads)
Puzzle_Maestro
Subject: Re: stuck in this sudoku @ 2019-11-23 6:15 PM (#27363 - in reply to #8611) (#27363) Top




Posts: 25
20
Location: United Kingdom		If you add up the clues on the top and bottom rows, you get 369. Adding up the clues in the left and right gives 327. The difference between the two is 42.

Observe that the arrows on the left and right point to 6 cells which are not pointed to by the arrows on top and bottom (with minimum sum 3*(1+2)=9), and similarly the arrows on top and bottom point to 6 cells not pointed to by arrows on the left and right (maximum sum 3*(8+9)=51). The difference between them must be 42, and since the maximum difference between them is 42, we can establish a few 12 and 89 pairs.
kishy72
Subject: Re: stuck in this sudoku @ 2019-11-25 8:52 AM (#27364 - in reply to #27363) (#27364) Top


SM 2020 (Math) Author

Posts: 419
100100100100
Location: India
Puzzle_Maestro - 2019-11-23 6:15 PM

If you add up the clues on the top and bottom rows, you get 369. Adding up the clues in the left and right gives 327. The difference between the two is 42.

Observe that the arrows on the left and right point to 6 cells which are not pointed to by the arrows on top and bottom (with minimum sum 3*(1+2)=9), and similarly the arrows on top and bottom point to 6 cells not pointed to by arrows on the left and right (maximum sum 3*(8+9)=51). The difference between them must be 42, and since the maximum difference between them is 42, we can establish a few 12 and 89 pairs.


Thanks a lot ! I could complete it with your pointer.
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