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Aug 2 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania
PostPosted: Sat Aug 01, 2015 10:27 pm    Post subject: Aug 2 VH Reply with quote
Code:

+----------+-------------+------------+
| 7  3 4   | 1  8   5    | 9   2  6   |
| 25 9 8   | 7  24  6    | 35  1  34  |
| 6  1 25  | 3  249 249  | 7   45 8   |
+----------+-------------+------------+
| 9  2 1   | 4  6   3    | 8   7  5   |
| 4  7 3   | 28 5   28   | 1   6  9   |
| 8  5 6   | 9  1   7    | 4   3  2   |
+----------+-------------+------------+
| 3  6 7   | 28 249 2489 | 25  59 1   |
| 1  4 29  | 5  37  29   | 6   8  37  |
| 25 8 259 | 6  37  1    | 23 49 347 |
+----------+-------------+------------+
XY-Wing 23-5 pivoted in r9c7; r2c1<>5; stte
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK
PostPosted: Sun Aug 02, 2015 12:51 am    Post subject: Reply with quote
Code:
.-------------.---------------.---------------.
|  7   3  4   | 1   8    5    |  9    2   6   |
| b25  9  8   | 7   24   6    | c35   1   34  |
|  6   1  25  | 3   249  249  |  7    45  8   |
:-------------+---------------+---------------:
|  9   2  1   | 4   6    3    |  8    7   5   |
|  4   7  3   | 28  5    28   |  1    6   9   |
|  8   5  6   | 9   1    7    |  4    3   2   |
:------------+---------------+----------------:
|  3   6  7   | 28  249  2489 | d25   59  1   |
|  1   4  29  | 5   37   29   |  6    8   37  |
| a25  8  259 | 6   37   1    |  3-2  49  347 |
'-------------'---------------'---------------'
(2=5)r9c1 - (5)r2c1 = r2c7 - (5=2)r7c7 => -2 r9c7; stte
Cool
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dongrave



Joined: 06 Mar 2014
Posts: 564
PostPosted: Sun Aug 02, 2015 3:03 pm    Post subject: Reply with quote
There's also the 35-2 XY-wing with pivot at r2c7 so r9c1<>2.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Aug 02, 2015 4:34 pm    Post subject: Reply with quote
dongrave wrote:
There's also the 35-2 XY-wing with pivot at r2c7 so r9c1<>2.


As is often the case, these puzzles offer a number of options, especially if one moves away from the VH moves. URs on 37 and 49, M-Wing on 25 and probably numerous chains.
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dongrave



Joined: 06 Mar 2014
Posts: 564
PostPosted: Sun Aug 02, 2015 10:00 pm    Post subject: Reply with quote
Hi Marty, I see the 37 UR that you mentioned (Type 1 at r89c59) and I see a 28 UR (Type 1 at r57c46) but I don't see the 49 that you mentioned? Where the heck is it and what type UR is it? Thanks, Don.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Aug 03, 2015 12:34 am    Post subject: Reply with quote
Quote:
Hi Marty, I see the 37 UR that you mentioned (Type 1 at r89c59) and I see a 28 UR (Type 1 at r57c46) but I don't see the 49 that you mentioned? Where the heck is it and what type UR is it?


Don, the 28 is another Type 1. The 49 I'd call a potential DP, not a UR. It's in r37 c56. Using internals, r3 c5 or 6 must be 2=> -2r2c5and r3c3. Using externals, r7c8=9. That can be the starting point of a chain that will set up pincers with r2c5 or r3c3.

Code:
.-------------.---------------.---------------.
|  7   3  4   | 1   8    5    |  9    2   6   |
| b25  9  8   | 7   24   6    | c35   1   34  |
|  6   1  25  | 3   249  249  |  7    45  8   |
:-------------+---------------+---------------:
|  9   2  1   | 4   6    3    |  8    7   5   |
|  4   7  3   | 28  5    28   |  1    6   9   |
|  8   5  6   | 9   1    7    |  4    3   2   |
:------------+---------------+----------------:
|  3   6  7   | 28  249  2489 | d25   59  1   |
|  1   4  29  | 5   37   29   |  6    8   37  |
| a25  8  259 | 6   37   1    |  3-2  49  347 |
'-------------'---------------'---------------'
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dongrave



Joined: 06 Mar 2014
Posts: 564
PostPosted: Mon Aug 03, 2015 1:01 am    Post subject: Reply with quote
Oh, I see! I thought I was missing something obvious. Thanks Marty!
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