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Apr 3 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Fri Apr 02, 2010 10:59 pm    Post subject: Apr 3 VH Reply with quote

XY-Wing 46 49 69 eliminating 6 in r5c2 solves the puzzle.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Apr 03, 2010 7:12 am    Post subject: Reply with quote

skyscraper 6 or
w-wing 46

The basics on this one gave me a fit. Good puzzle! Very Happy
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Apr 03, 2010 8:38 am    Post subject: Reply with quote

I used a couple of XY-wings. Needed first to find a hidden triple.

Keith
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Sat Apr 03, 2010 9:18 am    Post subject: Reply with quote

As an alternative to the skyscraper(6) there is a simple colour trap on 6 which removes 1 from r2c1 and solves puzzle
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Sat Apr 03, 2010 5:32 pm    Post subject: Apr 3 VH Reply with quote

peterj wrote:
Code:

As an alternative to the skyscraper (6) thre is a simple colour trap on 6 which removes 1 from r2c1 and solves the puzzle

But, 1 is in r2c1 for the solution in this puzzle. If you remove 1 in r2c1 what will be the solution?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Apr 03, 2010 7:15 pm    Post subject: Reply with quote

After basics:
Code:
+-------------------+-------------------+-------------------+
| 17    2     3     | 8     57    19    | 6     4     159   |
| 1-6   8     5     | 13469 349   13469 | 7     2     19    |
| 9     467   46r*  | 2     57    16    | 18    3     158   |
+-------------------+-------------------+-------------------+
| 27    79    8     | 5     6     2349  | 239   1     34    |
| 4     569   1     | 39    8     239   | 2359  56R   7     |
| 25    3     69R   | 49    1     7     | 25    8     46r   |
+-------------------+-------------------+-------------------+
| 36R*  1     49    | 7     49    8     | 35    56r   2     |
| 3568  569   2     | 1369  39    1369  | 4     7     1368  |
| 368   46    7     | 1346  2     5     | 18    9     1368  |
+-------------------+-------------------+-------------------+

He must mean remove 6 in R2C1.

I have shown a simple coloring chain that makes that elimination. Start in R7C1.

Keith
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Ema Nymton



Joined: 17 Apr 2009
Posts: 89

PostPosted: Sat Apr 03, 2010 7:25 pm    Post subject: Reply with quote

.

Puzzled ...

Code:

+--------------+-----------------+---------------+
| 17   2   3   | 8     57  19    | 6    4  159   |
| 16   8   5   | 13469 349 13469 | 7    2  19    |
| 9    467 46  | 2     57  16    | 158  3  158   |
+--------------+-----------------+---------------+
| 27   79  8   | 5     6   2349  | 239  1  34    |
| 4    569 1   | 39    8   239   | 2359 56 7     |
| 256  3   69* | 49    1   7     | 259  8  456   |
+--------------+-----------------+---------------+
| 356  1   469 | 7     349 8     | 35   56 2     |
| 3568 569 2   | 1369  39  1369  | 4    7  13568 |
| 368  46  7   | 1346  2   5     | 138  9  1368  |
+--------------+-----------------+---------------+


Draw/Play gives hint of '6' at r6c3.
Can one explain why?

Ema Nymton
~@:o|
.
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Sat Apr 03, 2010 7:59 pm    Post subject: Reply with quote

Ema Nymton wrote:
.

Puzzled ...

Code:

+--------------+-----------------+---------------+
| 17   2   3   | 8     57  19    | 6    4  159   |
| 16   8   5   | 13469 349 13469 | 7    2  19    |
| 9    467 46  | 2     57  16    | 158  3  158   |
+--------------+-----------------+---------------+
| 27   79  8   | 5     6   2349  | 239  1  34    |
| 4    569 1   | 39    8   239   | 2359 56 7     |
| 256  3   69* | 49    1   7     | 259  8  456   |
+--------------+-----------------+---------------+
| 356  1   469 | 7     349 8     | 35   56 2     |
| 3568 569 2   | 1369  39  1369  | 4    7  13568 |
| 368  46  7   | 1346  2   5     | 138  9  1368  |
+--------------+-----------------+---------------+


Draw/Play gives hint of '6' at r6c3.
Can one explain why?

There's probably something more common, but an m-wing handles it straight away.

(9=4)r6c4-(4)r9c4=(4-9)r7c5=(9)r7c3 =>r6c3<>9
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Sat Apr 03, 2010 8:35 pm    Post subject: Reply with quote

Ema,

I am not sure why draw/play suggests that.

But, look for hidden pairs in C7 and in R7, and you should be on your way.

As I have said before, Sudoku Susser can explain the moves.

Keith
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sun Apr 04, 2010 12:25 am    Post subject: Reply with quote

I used Clement's xy-wing.
Dan, glad to see that others sometimes have problems with basics, like I did a few days ago!
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Apr 05, 2010 11:04 am    Post subject: Re: Apr 3 VH Reply with quote

Clement wrote:
peterj wrote:
Code:

As an alternative to the skyscraper (6) thre is a simple colour trap on 6 which removes 1 from r2c1 and solves the puzzle

But, 1 is in r2c1 for the solution in this puzzle. If you remove 1 in r2c1 what will be the solution?


Clement, sorry that should have been colouring on 6s removing a 6 from r2c1 (leaving only the 1).
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