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An extra VH for today (011318)

 
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immpy



Joined: 06 May 2017
Posts: 156

PostPosted: Sat Jan 13, 2018 1:59 pm    Post subject: An extra VH for today (011318) Reply with quote

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 |
+-------+-------+-------+

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

PostPosted: Sun Jan 14, 2018 2:47 am    Post subject: Reply with quote

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: 156

PostPosted: Sun Jan 14, 2018 2:09 pm    Post subject: Reply with quote

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  |
+-----------+----------+-----------+

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

PostPosted: Sun Jan 14, 2018 5:29 pm    Post subject: Reply with quote

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 (=Cool!


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: 156

PostPosted: Mon Jan 15, 2018 9:06 am    Post subject: Reply with quote

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

PostPosted: Mon Jan 15, 2018 4:11 pm    Post subject: Reply with quote

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: 251
Location: Rimini, Italy

PostPosted: Mon Jan 15, 2018 11:33 pm    Post subject: Reply with quote

[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: 3333
Location: near Detroit, Michigan, USA

PostPosted: Tue Jan 16, 2018 7:19 pm    Post subject: Reply with quote

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

PostPosted: Wed Jan 17, 2018 9:16 pm    Post subject: Reply with quote

[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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