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immpy
Joined: 06 May 2017
Posts: 571
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 Posted: Sat Jan 13, 2018 1:59 pm Post subject: An extra VH for today (011318) |
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A Very Hard puzzle similar to those that are common on this website.
Enjoy the puzzle...
| Code: |
+-------+-------+-------+
| 7 . . | 6 9 . | 8 . . |
| . 2 . | . . 4 | . . . |
| 9 . . | 2 5 . | 3 . . |
+-------+-------+-------+
| 6 . 7 | . . . | 5 . . |
| . 5 8 | . . . | 6 4 . |
| . . . | . . 6 | . . 3 |
+-------+-------+-------+
| 3 . 2 | . . . | 9 . . |
| . 6 1 | . . . | 4 3 . |
| . . . | . . 5 | . . 2 |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jan 14, 2018 2:47 am Post subject: |
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| Code: | ┌────────────────────┬────────────────────┬────────────────────┐
│ 7 4 3 │ 6 9 1 │ 8 2 5 │
│ │ │ │
│ 18 2 5 │ 378 378 4 │ 17 69 69 │
│ │ │ │
│ 9 18 6 │ 2 5 78 │ 3 17 4 │
├────────────────────┼────────────────────┼────────────────────┤
│ 6 3 7 │ 1489 1248 29 │ 5 189 189 │
│ │ │ │
│ 2 5 8 │ 179 17 3 │ 6 4 179 │
│ │ │ │
│ 14 19 49 │ 5 78 6 │ 2 78 3 │
├────────────────────┼────────────────────┼────────────────────┤
│ 3 78 2 │ 14 146 78 │ 9 5 16 │
│ │ │ │
│ 5 6 1 │ 789 278 29 │ 4 3 78 │
│ │ │ │
│ 48 789 49 │ 13 136 5 │ 17 1678 2 │
└────────────────────┴────────────────────┴────────────────────┘ |
XY-Wing (18-7) pivot r3c2
7r3c8=7r7c2
7r3c8-(7=1)r2c7-(1=7)r9c7-(7=8)r8c9
7r7c2-(7=8)r7c6-r8c45=8r8c9=> 8r8c9 |
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immpy
Joined: 06 May 2017
Posts: 571
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| Posted: Sun Jan 14, 2018 2:09 pm Post subject: |
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Beautiful Marty. You found the XY-Wing that broke it open, flightless though it was. An extension was the key. There were too many 1s, 7s, and 8s on this grid for me to find the magic by going that route.
After basics I was at this stage....
| Code: |
+-----------+----------+-----------+
| 7 4 3 | 6 9 1 | 8 2 5 |
| 18 2 5 | 78 3 4 | 17 6 9 |
| 9 18 6 | 2 5 78 | 3 17 4 |
+-----------+----------+-----------+
| 6 3 7 | 4 18 2 | 5 9 18 |
| 2 5 8 | 9 17 3 | 6 4 17 |
| 14 19 49 | 5 78 6 | 2 78 3 |
+-----------+----------+-----------+
| 3 78 2 | 1 4 78 | 9 5 6 |
| 5 6 1 | 78 2 9 | 4 3 78 |
| 48 789 49 | 3 6 5 | 17 178 2 |
+-----------+----------+-----------+
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Play this puzzle online at the Daily Sudoku site
By looking for the strong links (a la Keith) I was able to find the upside-down skyscraper on 7 in r2c47, r8c4, and r9c7. This made r8c9<>7 (=8)!
...and the dominoes fell.....
I almost went for a BUG+2, which would also do the trick....
Thanks all....
immp |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Jan 14, 2018 5:29 pm Post subject: |
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| Quote: | By looking for the strong links (a la Keith) I was able to find the upside-down skyscraper on 7 in r2c47, r8c4, and r9c7. This made r8c9<>7 (= ! |
I'm not sure what an upside-down skyscraper is, but there is a standard skyscraper in r48 resulting in -7r9c7. Looking at the grid again, there is also a standard skyscraper in c47
However, our after-basics grids don't match. |
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immpy
Joined: 06 May 2017
Posts: 571
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| Posted: Mon Jan 15, 2018 9:06 am Post subject: |
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Just noting that this particular skyscraper had the "roof" on the bottom of the columns r8and 9, and the "floor" was at the top of the columns r2. Just trying to be more descriptive for folks trying to see them for a first time, maybe. They lay sideways sometime, as well. All skyscrapers are trapezoids, essentially, and I've seen them referred to as that.
cheers...immp |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jan 15, 2018 4:11 pm Post subject: |
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| Quote: | | All skyscrapers are trapezoids, |
They are indeed, but I've never seen the term here. |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
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| Posted: Mon Jan 15, 2018 11:33 pm Post subject: |
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[quote="Marty R."] | Code: | ┌────────────────────┬────────────────────┬────────────────────┐
│ 7 4 3 │ 6 9 1 │ 8 2 5 │
│ │ │ │
│ 18 2 5 │ 378 378 4 │ 17 69 69 │
│ │ │ │
│ 9 18 6 │ 2 5 78 │ 3 17 4 │
├────────────────────┼────────────────────┼────────────────────┤
│ 6 3 7 │ 1489 1248 29 │ 5 189 189 │
│ │ │ │
│ 2 5 8 │ 179 17 3 │ 6 4 179 │
│ │ │ │
│ 14 19 49 │ 5 78 6 │ 2 78 3 │
├────────────────────┼────────────────────┼────────────────────┤
│ 3 78 2 │ 14 146 78 │ 9 5 16 │
│ │ │ │
│ 5 6 1 │ 789 278 29 │ 4 3 78 │
│ │ │ │
│ 48 789 49 │ 13 136 5 │ 17 1678 2 │
└────────────────────┴────────────────────┴────────────────────┘ |
Hi everyone,
Simple colors with number 7
Black: r2c7,r3c6,r7c2
White: r3c8,r7c6,r9c27
and -7 in White
Ciao Gianni |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Jan 16, 2018 7:19 pm Post subject: |
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| Marty R. wrote: | | Quote: | | All skyscrapers are trapezoids, |
They are indeed, but I've never seen the term here. |
All X-wings are skyscrapers, and are two strong link (Turbot) patterns.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jan 17, 2018 9:16 pm Post subject: |
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[quote="ZeroAssoluto"] | Marty R. wrote: | | Code: | ┌────────────────────┬────────────────────┬────────────────────┐
│ 7 4 3 │ 6 9 1 │ 8 2 5 │
│ │ │ │
│ 18 2 5 │ 378 378 4 │ 17 69 69 │
│ │ │ │
│ 9 18 6 │ 2 5 78 │ 3 17 4 │
├────────────────────┼────────────────────┼────────────────────┤
│ 6 3 7 │ 1489 1248 29 │ 5 189 189 │
│ │ │ │
│ 2 5 8 │ 179 17 3 │ 6 4 179 │
│ │ │ │
│ 14 19 49 │ 5 78 6 │ 2 78 3 │
├────────────────────┼────────────────────┼────────────────────┤
│ 3 78 2 │ 14 146 78 │ 9 5 16 │
│ │ │ │
│ 5 6 1 │ 789 278 29 │ 4 3 78 │
│ │ │ │
│ 48 789 49 │ 13 136 5 │ 17 1678 2 │
└────────────────────┴────────────────────┴────────────────────┘ |
Hi everyone,
Simple colors with number 7
Black: r2c7,r3c6,r7c2
White: r3c8,r7c6,r9c27
and -7 in White
Ciao Gianni |
Simple coloring: 7r2c7-r3c8=r3c6-r7c6=r7c2-r9c2=> -7r9c7 |
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