## Need help with Denksport Sudoku 8-9 nr. 125 puzzle

Post the puzzle or solving technique that's causing you trouble and someone will help

### Need help with Denksport Sudoku 8-9 nr. 125 puzzle

Hi, please see attached puzzle. I have pencilmarked all candidates possible. I have used the "normal" solving techniques and also (I think) found a Y-Wing that eliminated 6 or r5c8. There is information about the X and Y wing in the first page of this magazine so I am guessing those should be sufficient to solve the puzzle. Thanks in advance for any help.
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Puzzle with pencilmarks
20200827_151536 (1) (2).jpg (180.31 KiB) Viewed 101 times
richardberg.rb

Posts: 3
Joined: 10 August 2020

### Re: Need help with Denksport Sudoku 8-9 nr. 125 puzzle

An XY Wing won't help here but a Skyscraper will :

Code: Select all
`*--------------------------------------------------------------------------------*| 5       1       9        | 3       8       4        | 2       7       6        || 8       2       4        | 16      7       16       | 9       3       5        || 3       6       7        | 2       5       9        | 8       4       1        ||--------------------------+--------------------------+--------------------------|| 67      378     38       | 5       4       23       | 1       26      9        ||b69      35      1        | 7      a69      23       | 4       25      8        || 4       59      2        | 16-9    169     8        | 3       56      7        ||--------------------------+--------------------------+--------------------------|| 1       4       6        | 8       3       7        | 5       9       2        ||c79      38      38       |d69      2       5        | 67      1       4        || 2       79      5        | 4       16-9    16       | 67      8       3        |*--------------------------------------------------------------------------------*`

It's in cells marked a-b-c-d. One of cell a or d must be 9, so you can remove the 9's as shown and the puzzle solves easily from there. You can read about Skyscrapers here.

Leren
Leren

Posts: 4013
Joined: 03 June 2012

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