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April 29 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Apr 29, 2017 5:30 am    Post subject: April 29 VH Reply with quote
Code:

+------------+-----------------+------------+
| 8  2   4   | 367  3679 3679  | 79  5  1   |
| 16 69  7   | 12   5    129   | 4   3  8   |
| 13 39  5   | 147  1479 8     | 2   79 6   |
+------------+-----------------+------------+
| 37 8   1   | 9    2    37    | 5   6  4   |
| 5  67  9   | 1467 1467 1467  | 8   2  3   |
| 2  4   36  | 36   8    5     | 1   79 79  |
+------------+-----------------+------------+
| 4  367 8   | 5    367  2367  | 679 1  279 |
| 67 1   26  | 2467 4679 24679 | 3   8  5   |
| 9  5   236 | 8    1367 12367 | 67  4  27  |
+------------+-----------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
This gave me more trouble than usual
1) W-Wing (67),b47, SL 6 in c3=> -7r4c1,r7c2
2) XY-Wing (69-4), pivot r1c6=> -4r5c5
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
PostPosted: Sat Apr 29, 2017 7:00 am    Post subject: XY solution Reply with quote
Can't imagine that you of all people missed the XY wing 367 pivot r4c1
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 871
Location: Rimini, Italy
PostPosted: Sat Apr 29, 2017 8:42 am    Post subject: Reply with quote
Hi everyone,

for Marty R.
If I don't make mistakes, the W-Wing is enough to get to the scheme solution without having to use the XY-Wing.

another possible solution, although very long
Quote:
XY-Chain r4c6 - r4c1 - r8c1 - r2c1 - r3c1 - r3c2 - r2c2 - r5c2 and -7 in r5c456, r4c1.


Ciao Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Apr 29, 2017 4:47 pm    Post subject: Reply with quote
Quote:
Can't imagine that you of all people missed the XY wing 367 pivot r4c1


Quote:
for Marty R.
If I don't make mistakes, the W-Wing is enough to get to the scheme solution without having to use the XY-Wing.


Don't overestimate me. I make a lot of errors doing these things with pencil and paper.
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 871
Location: Rimini, Italy
PostPosted: Sat Apr 29, 2017 8:13 pm    Post subject: Reply with quote
Marty R. wrote:

Don't overestimate me. I make a lot of errors doing these things with pencil and paper.


Hi Marty,
I didn't want to correct anyone, I can't afford it.
It was just to compare my notes with yours; I could be wrong.
Ciao, at the next pattern.
Gianni
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