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Mar 08 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 632
Location: Rimini, Italy

PostPosted: Mon Mar 08, 2021 10:00 am    Post subject: Mar 08 VH Reply with quote

Hi everyone,

Code:

+-------------+--------------+------------+
| 7    12 9   | 5   16   3   | 8   4   26 |
| 3    6  8   | 2   4    7   | 9   5   1  |
| 5    4  12  | 169 8    169 | 3   7   26 |
+-------------+--------------+------------+
| 12   5  3   | 8   1267 16  | 267 9   4  |
| 8    9  126 | 3   1267 4   | 267 26  5  |
| 4    7  26  | 69  269  5   | 1   8   3  |
+-------------+--------------+------------+
| 1269 3  7   | 4   1569 169 | 256 126 8  |
| 126  12 4   | 7   156  8   | 256 3   9  |
| 169  8  5   | 169 3    2   | 4   16  7  |
+-------------+--------------+------------+

Play this puzzle online at the Daily Sudoku site

Skyscraper with number 1 in r1c25,r5c35 and -1 in r3c3

Ciao Gianni
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dongrave



Joined: 06 Mar 2014
Posts: 443

PostPosted: Mon Mar 08, 2021 5:11 pm    Post subject: Reply with quote

Using just VH moves there's a 12-6 XY Wing with pivot at r4c1 (-6r6c45) which then opens up a 26-1 XY Wing with pivot at r7c1 (as well as another 12-6 XY Wing with pivot at r4c1) which solves it.
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TomC



Joined: 30 Oct 2020
Posts: 107
Location: Wales

PostPosted: Tue Mar 09, 2021 3:01 pm    Post subject: Reply with quote

r5c5 <>1 as then r3c3 = 1 and no 1's in box 2
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dongrave



Joined: 06 Mar 2014
Posts: 443

PostPosted: Wed Mar 10, 2021 1:46 pm    Post subject: Reply with quote

Another way to represent Tom's neat solution would be the following chain with pincers on both ends. 1r5c3 = r3c3 - r1c2 = r1c5 => r5c5 <> 1.
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