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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
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 Posted: Thu Jan 27, 2022 2:05 pm Post subject: Jan 27 VH |
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Hi everyone,
| Code: |
+-----------+----------+----------+
| 67 8 67 | 5 1 2 | 3 9 4 |
| 3 4 1 | 7 9 8 | 2 5 6 |
| 5 9 2 | 6 4 3 | 18 7 18 |
+-----------+----------+----------+
| 8 17 5 | 19 3 4 | 6 2 179 |
| 2 3 79 | 8 6 179 | 5 4 179 |
| 179 6 4 | 2 5 179 | 17 8 3 |
+-----------+----------+----------+
| 169 5 69 | 4 2 19 | 78 3 78 |
| 4 2 8 | 3 7 6 | 9 1 5 |
| 179 17 3 | 19 8 5 | 4 6 2 |
+-----------+----------+----------+
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Play this puzzle online at the Daily Sudoku site
| Quote: | | Skyscraper with number 9 in r6c16,r9c14 and -9 in r4c4,r7c6 |
Ciao Gianni |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Thu Jan 27, 2022 2:19 pm Post subject: |
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| I used the 17-9 XY-Wing with pivot at r4c2 (-9r5c6) which then opened up another 17-9 XY-Wing with pivot at r5c6 (-9r7c3). |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 4:14 pm Post subject: |
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Two steps for me
X wing on <1> in r49c24 gives -1 in r9c1 (and r4c9)
then XY wing <679> pivot r7c3 gives -7 in r1c1 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 4:16 pm Post subject: |
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| Code: |
+-----------+----------+----------+
|67 8 67 | 5 1 2 | 3 9 4 |
| 3 4 1 | 7 9 8 | 2 5 6 |
| 5 9 2 | 6 4 3 | 18 7 18 |
+-----------+----------+----------+
| 8 17 5 | 19 3 4 | 6 2 179 |
| 2 3 79c| 8 6 179 | 5 4 179 |
| 179b 6 4 | 2 5 179a| 17 8 3 |
+-----------+----------+----------+
| 169 5 69d | 4 2 x19x| 78 3 78 |
| 4 2 8 | 3 7 6 | 9 1 5 |
| 179 17 3 | 19 8 5 | 4 6 2 |
+-----------+----------+----------+
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Sorry for the scruffy graphics but Strong links (a-b-c-d) on 9's provide a similar result to Gianni but with a kite. r7c6 < > 9 |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 8:00 pm Post subject: |
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Again another similar result using the 9's
r5c9 <> 9 as then d=9, a=9, leaves no room for <9> in box 4 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 8:47 pm Post subject: |
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| ….and drops two 9’s in column 9 ! |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 8:55 pm Post subject: |
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| Mogulmeister wrote: | | ….and drops two 9’s in column 9 ! |
Not sure about this, do you mean c3? |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:21 pm Post subject: |
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So lets start with your 9 in r5c9
(17=9)r5c9-r5c3=r7c3-r9c1=r9c4-r4c5=(9-17)r4c9
Two 9's in column 9 so r5c9 < > 9 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:34 pm Post subject: |
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In case you're a visual type (I am)
Green is true and red is false
 |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 9:35 pm Post subject: |
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| Understand now, I just think if you drop a number from a column you remove it |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:35 pm Post subject: |
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| We were here before with Immp's puzzle too ? |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:40 pm Post subject: |
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| TomC wrote: | Again another similar result using the 9's
r5c9 <> 9 as then d=9, a=9, |
and if I can complete your chain Tom..and r4c4 is < >9 and r4c9 is 9 ! |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 9:41 pm Post subject: |
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| If r5c9=9 then r4c4=9, x=9 , no <9> in c3 is where I thought you were |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:43 pm Post subject: |
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| TomC wrote: | | Understand now, I just think if you drop a number from a column you remove it |
Think loops! All those contradiction loops that set off on their logical path and turn round to bite themselves on the àrse! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:43 pm Post subject: |
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| TomC wrote: | | If r5c9=9 then r4c4=9, x=9 , no <9> in c3 is where I thought you were |
Which is fair enough too ! |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:44 pm Post subject: |
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| The point is once something is wrong contradictions appear everywhere and in many forms. |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Thu Jan 27, 2022 9:48 pm Post subject: |
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| Exactly, it's the way I see 'em |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Thu Jan 27, 2022 9:50 pm Post subject: |
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| You are the Frank Carson of Sudoku! (even if he's the wrong type of Celt) |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri Jan 28, 2022 8:26 am Post subject: |
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| Mogulmeister wrote: | In case you're a visual type (I am)
Green is true and red is false
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The sequence of these loops is important. Above shows the initial move from r5c9 (=9) green to r5c3 (< > 9) red which leads to two 9’s in col 9
Using the same strong links, look what happens when your first step from r5c9 (=9) is to r4c9 (< > 9). Apart from the start cell at r5c9, all the greens become reds (< > 9) and reds become green (=9).
This then gives you two 9’s in row 5 ! Different contradiction but same result
r5c9 < > 9. |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Fri Jan 28, 2022 10:11 am Post subject: |
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| There is only one way to describe this puzzle |
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