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Feb 28 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 942
Location: Rimini, Italy
PostPosted: Tue Feb 27, 2018 11:20 pm    Post subject: Feb 28 VH Reply with quote
Hi everyone,

Code:

+----------+--------------+---------+
| 3   1 57 | 6   457 457  | 2   9 8 |
| 2   9 4  | 3   8   1    | 6   7 5 |
| 6   8 57 | 29  579 257  | 1   3 4 |
+----------+--------------+---------+
| 589 7 89 | 18  15  6    | 3   4 2 |
| 1   3 6  | 4   2   9    | 5   8 7 |
| 58  4 2  | 7   35  358  | 9   6 1 |
+----------+--------------+---------+
| 4   2 19 | 19  6   78   | 78  5 3 |
| 7   6 18 | 5   134 348  | 48  2 9 |
| 89  5 3  | 289 479 2478 | 478 1 6 |
+----------+--------------+---------+

Play this puzzle online at the Daily Sudoku site

Quote:
W-Wing 8,9 in r4c3,r9c1 connected by number 8 in r49c4 and -9 in r4c1,r7c3
or
W-Wing 1,8 in r4c4,r8c3 connected by number 1 in r7c34 and -8 in r4c3
or
XY-Wing 1,8,9 in r4c34,r7c3 and -1 in r7c4
or
XY-Wing 1,8,9 in r4c34,r7c4 and -9 in r7c3
or
Skyscraper with number 8 in r48c3,r49c4 and -8 in r8c6,r9c1


Ciao Gianni
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Wed Feb 28, 2018 8:18 am    Post subject: Reply with quote
Hi everyone
[(8-9)R4C3=9R7C3-9R9C1 and 8R4C3-8R4C4=8R9C4-8R9C1]=>contradiction (R9C1=Ø)=>-8R4C3=>stte.
Ciao a Tutti
Paolo
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Wed Feb 28, 2018 2:00 pm    Post subject: Reply with quote
I'll simply leave it to others to solve this with divergent routes. But, of course, you know, there is an XY-Wing which solves it in one step.

cheers...immp
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Feb 28, 2018 3:21 pm    Post subject: Reply with quote
Code:
┌────────────────────┬────────────────────┬────────────────────┐
│    3      1     57 │    6    457    457 │    2      9      8 │
│                    │                    │                    │
│    2      9      4 │    3      8      1 │    6      7      5 │
│                    │                    │                    │
│    6      8     57 │   29    579    257 │    1      3      4 │
├────────────────────┼────────────────────┼────────────────────┤
│  589      7     89 │   18     15      6 │    3      4      2 │
│                    │                    │                    │
│    1      3      6 │    4      2      9 │    5      8      7 │
│                    │                    │                    │
│   58      4      2 │    7     35    358 │    9      6      1 │
├────────────────────┼────────────────────┼────────────────────┤
│    4      2     19 │   19      6     78 │   78      5      3 │
│                    │                    │                    │
│    7      6     18 │    5    134    348 │   48      2      9 │
│                    │                    │                    │
│   89      5      3 │  289    479   2478 │  478      1      6 │
└────────────────────┴────────────────────┴────────────────────┘


Kite (8) hinged b4 8r8c3=r6c6-r789c6=r9c4=> -8r9c1
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