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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
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 Posted: Mon Mar 08, 2021 10:00 am Post subject: Mar 08 VH |
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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 |
+-------------+--------------+------------+
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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: 568
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| Posted: Mon Mar 08, 2021 5:11 pm Post subject: |
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| 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: 358
Location: Wales
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| Posted: Tue Mar 09, 2021 3:01 pm Post subject: |
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| r5c5 <>1 as then r3c3 = 1 and no 1's in box 2 |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Wed Mar 10, 2021 1:46 pm Post subject: |
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| 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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