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Mar 28 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 936
Location: Rimini, Italy
PostPosted: Tue Mar 27, 2018 10:17 pm    Post subject: Mar 28 VH Reply with quote
Hi everyone,

Code:

+-----------+--------+----------+
| 24 5   1  | 9  7 8 | 3  24  6 |
| 9  38  7  | 23 4 6 | 28 1   5 |
| 6  348 28 | 23 5 1 | 7  248 9 |
+-----------+--------+----------+
| 8  2   5  | 7  3 4 | 6  9   1 |
| 1  9   3  | 6  2 5 | 4  7   8 |
| 47 47  6  | 8  1 9 | 5  3   2 |
+-----------+--------+----------+
| 5  6   28 | 4  9 7 | 1  28  3 |
| 3  1   4  | 5  8 2 | 9  6   7 |
| 27 78  9  | 1  6 3 | 28 5   4 |
+-----------+--------+----------+

Play this puzzle online at the Daily Sudoku site

Quote:
Skyscraper with number 2 in r1c18,r9c17 and -2 in r2c7,r7c8
or
Skyscraper with number 2 in r1c18,r7c38 and -2 in r9c1,r3c3
or
Skyscraper with number 2 in r19c1,r29c7 and -2 in r1c8
or
W-Wing 2,8 in r2c7,r3c3 connected by number 2 in r1c18 and -8 in r2c2,r3c8
or
W-Wing 2,8 in r3c3,r7c8 connected by number 2 in r1c18 and -8 in r7c3,r3c8
or
XY-Wing 2,3,8 in r2c2,r3c34 and -3 in r2c4,r3c2
or
XY-Wing 2,3,8 in r2c24,r3c3 and -2 in r3c4


Ciao Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Mar 28, 2018 4:56 am    Post subject: Reply with quote
Code:
┌─────────────────┬─────────────────┬─────────────────┐
│  24     5     1 │   9     7     8 │   3    24     6 │
│                 │                 │                 │
│   9    38     7 │  23     4     6 │  28     1     5 │
│                 │                 │                 │
│   6   348    28 │  23     5     1 │   7   248     9 │
├─────────────────┼─────────────────┼─────────────────┤
│   8     2     5 │   7     3     4 │   6     9     1 │
│                 │                 │                 │
│   1     9     3 │   6     2     5 │   4     7     8 │
│                 │                 │                 │
│  47    47     6 │   8     1     9 │   5     3     2 │
├─────────────────┼─────────────────┼─────────────────┤
│   5     6    28 │   4     9     7 │   1    28     3 │
│                 │                 │                 │
│   3     1     4 │   5     8     2 │   9     6     7 │
│                 │                 │                 │
│  27    78     9 │   1     6     3 │  28     5     4 │
└─────────────────┴─────────────────┴─────────────────┘


BUG+2 8r3c2=2r3c8-(2=8)r7c8=> -8r3c8
Or last term -(2=8)r3c3=> -8r2c2
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Mar 28, 2018 2:24 pm    Post subject: Reply with quote
I think Gianni's second 'W wing' is a bit more complex. Obviously if r3c3=2: r7c3=8 and r7c8=2. What the 'W wing' on r1 shows is that r3c3 and r7c8 can't both be 2 so therefore both must be 8. Don't know what this is called though.....
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Mar 28, 2018 5:50 pm    Post subject: Reply with quote
hughwill wrote:
I think Gianni's second 'W wing' is a bit more complex. Obviously if r3c3=2: r7c3=8 and r7c8=2. What the 'W wing' on r1 shows is that r3c3 and r7c8 can't both be 2 so therefore both must be 8. Don't know what this is called though.....


Here is Gianni's explanation of the 2nd W-Wing
W-Wing 2,8 in r3c3,r7c8 connected by number 2 in r1c18 and -8 in r7c3,r3c8

This is an ordinary W-Wing. Hugh, you say it's more complex, but more complex than what? I don't know what you're trying to say about both can't be 2 so both must be 8. That is certainty true, but can't you make a similar comment about every W-Wing?

The pattern is interesting with the 2s in r1 connecting two separate W-Wings on 28. I don't know if I've ever seen that.

Perhaps if Keith sees this, he can add something intelligent.






Code:
┌─────────────────┬─────────────────┬─────────────────┐
│  24     5     1 │   9     7     8 │   3    24     6 │
│                 │                 │                 │
│   9    38     7 │  23     4     6 │  28     1     5 │
│                 │                 │                 │
│   6   348    28 │  23     5     1 │   7   248     9 │
├─────────────────┼─────────────────┼─────────────────┤
│   8     2     5 │   7     3     4 │   6     9     1 │
│                 │                 │                 │
│   1     9     3 │   6     2     5 │   4     7     8 │
│                 │                 │                 │
│  47    47     6 │   8     1     9 │   5     3     2 │
├─────────────────┼─────────────────┼─────────────────┤
│   5     6    28 │   4     9     7 │   1    28     3 │
│                 │                 │                 │
│   3     1     4 │   5     8     2 │   9     6     7 │
│                 │                 │                 │
│  27    78     9 │   1     6     3 │  28     5     4 │
└─────────────────┴─────────────────┴─────────────────┘
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