Stuck On This Puzzle, Please Help "Extreme"

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Stuck On This Puzzle, Please Help "Extreme"

Postby Jacky » Sat Jun 18, 2016 7:12 am

I tried in the bottom right between 1 & 9 and would reach an answer, but I was wondering how to do it with purely notes. Please take it slow, I'm new to notes.
Thank you.
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Re: Stuck On This Puzzle, Please Help "Extreme"

Postby JasonLion » Sat Jun 18, 2016 11:10 am

98.3751.227...853.35...28.756329.7.87.856392..2978.3568.24576.3..583627.637129485

I see a Unique Rectangle (type 2), followed shortly by a BUG+1.
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Re: Stuck On This Puzzle, Please Help "Extreme"

Postby Leren » Sat Jun 18, 2016 11:24 am

I recently mentioned in another thread here that Skyscrapers are quite often found to be the solution to queries we get. It didn't take long for one to come up.

Code: Select all
*-----------------------------------------------------*
| 9    8    46    | 3    7    5     | 1    46   2     |
| 2    7    146   | 69   14   8     | 5    3    49    |
| 3    5    146   | 69   14   2     | 8    469  7     |
|-----------------+-----------------+-----------------|
| 5    6    3     | 2    9    14    | 7    4-1  8     |
| 7   b14   8     | 5    6    3     | 9    2   a14    |
| 14   2    9     | 7    8    14    | 3    5    6     |
|-----------------+-----------------+-----------------|
| 8   c19   2     | 4    5    7     | 6   d19   3     |
| 14   149  5     | 8    3    6     | 2    7    9-1   |
| 6    3    7     | 1    2    9     | 4    8    5     |
*-----------------------------------------------------*

There is a Skyscraper in 1's in cells a, b, c and d. At least one one of cell a or d must be 1 so you can remove the 1's from r4c8 and r8c9, solving the puzzle.

If you want further explanation of how Skyscrapers work just ask and I'll explain further, or you can learn about them here.

Yogi please take note, Leren
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Re: Stuck On This Puzzle, Please Help "Extreme"

Postby Jacky » Sun Jun 19, 2016 7:38 am

Skyscraper huh?
Couldn't R6 and R8 in C1, and R5 and R9 in C9 be a "Skyscaper" as well?
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Re: Stuck On This Puzzle, Please Help "Extreme"

Postby Leren » Sun Jun 19, 2016 8:41 pm

Yes, there is a Skyscraper in 1's in r68c1 and r5c8c9 which eliminates the 1 in r5c2 and solves the puzzle.

I see you've got the idea, nicely spotted, Leren
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Re: Stuck On This Puzzle, Please Help "Extreme"

Postby Jacky » Wed Jun 22, 2016 10:03 pm

Thank you very much, Leren!

I really enjoy solving Sudokus
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