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Jul 3 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania

PostPosted: Sun Jul 03, 2016 12:00 am    Post subject: Jul 3 VH Reply with quote

Code:

+----------------+------------+--------------+
| 1479  2    147 | 8  5   19  | 3  6   14    |
| 1489  49   148 | 3  2   6   | 7  459 1458  |
| 13689 369  5   | 14 149 7   | 18 29  128   |
+----------------+------------+--------------+
| 2     7    14  | 9  13  5   | 6  8   34    |
| 146   46   9   | 2  8   13  | 5  34  7     |
| 5     8    3   | 7  6   4   | 2  1   9     |
+----------------+------------+--------------+
| 3789  35   78  | 6  139 139 | 4  235 12358 |
| 3489  3459 6   | 14 7   2   | 18 35  1358  |
| 34    1    2   | 5  34  8   | 9  7   6     |
+----------------+------------+--------------+

X-Wing on 1 in col 47; rc3c159, r8c9 <>1 and
XY-Wing 34-1 pivoted in r9c5; r7c5 <>1 opens
XY-Wing 23-9 pivoted in r7c8; r3c5 <> 9; stte
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Sun Jul 03, 2016 7:11 am    Post subject: Reply with quote

Code:
+-----------------+---------------+---------------------+
| 1479  2     147 | 8    5    19  | 3     6    14       |
| 1489  49    148 | 3    2    6   | 7     459  145      |
| 36    36    5   | 14   149  7   | (18)  29   1(28)    |
+-----------------+---------------+---------------------+
| 2     7     14  | 9    13   5   | 6     8    34       |
| 146   46    9   | 2    8    13  | 5     34   7        |
| 5     8     3   | 7    6    4   | 2     1    9        |
+-----------------+---------------+---------------------+
| 378   35    78  | 6    139  139 | 4     235  358(2-1) |
| 3489  3459  6   | 4-1  7    2   | 8(1)  35   358(1)   |
| 34    1     2   | 5    34   8   | 9     7    6        |
+-----------------+---------------+---------------------+
L3-Wing{1C7, 8R3, 2C9} -> -{1r7c9}; Pointing{1B9} -> -{1r8c4}; stte
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Tue Jul 05, 2016 9:47 am    Post subject: Removing the 5 from r7c8 Reply with quote

Clement's Final wing needs the 5 to be removed from r7c8
Proving that this cell is not 5 can be done thus - if it were 5 then the 28 in cells r78c9 give cell r3c9 desolate. However this type of logic is not usual for a VH problem.
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK

PostPosted: Wed Jul 06, 2016 3:56 pm    Post subject: Reply with quote

Code:
.------------------.-----------------.--------------------.
| 1479   2     147 |  8    5     19  |  3    6     14     |
| 1489   49    148 |  3    2     6   |  7    459   145    |
| 36     36    5   | c14   149   7   | c18   9-2  c128    |
:------------------+-----------------+--------------------:
| 2      7     14  |  9    13    5   |  6    8     34     |
| 146    46    9   |  2    8     13  |  5    34    7      |
| 5      8     3   |  7    6     4   |  2    1     9      |
:------------------+-----------------+--------------------:
| 378   a35    78  |  6   b139  b139 |  4   a235   1358-2 |
| 3489   3459  6   | b14   7     2   |  18   35    1358   |
| 34     1     2   |  5    34    8   |  9    7     6      |
'------------------'-----------------'--------------------'
(2=3)r7c28 - (3=4)r7c56,r8c4 - (4=2)r3c479 => -2 r3c8,r7c9; stte
Cool
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Thu Jul 07, 2016 5:54 am    Post subject: Re: Removing the 5 from r7c8 Reply with quote

George Woods wrote:
Clement's Final wing needs the 5 to be removed from r7c8
Proving that this cell is not 5 can be done thus - if it were 5 then the 28 in cells r78c9 give cell r3c9 desolate. However this type of logic is not usual for a VH problem.

No, that's not right George. The 5 gets removed from r7c8 with just Clement's wings and basics. Clement's initial grid has a hidden 36 pair in row 3 so r3c12 = 36. Then his X Wing removes 1 from r3c59 and r8c9. The 34-1 XY Wing removes 1 from r7c5 which leaves a lone 1 in column 5 so r4c5=1 which means r5c6<>1 so it's 3 and r4c3<>1 so it's 4 so r5c2<>4 so it's 6 so r3c2<>6 so it's 3 so r7c2<>3 so it's 5 so r7c8<>5.
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