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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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 Posted: Fri Apr 02, 2010 10:59 pm Post subject: Apr 3 VH |
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| 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
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| Posted: Sat Apr 03, 2010 7:12 am Post subject: |
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skyscraper 6 or
w-wing 46
The basics on this one gave me a fit. Good puzzle!  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Apr 03, 2010 8:38 am Post subject: |
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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
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| Posted: Sat Apr 03, 2010 9:18 am Post subject: |
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| 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: 1113
Location: Dar es Salaam Tanzania
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| Posted: Sat Apr 03, 2010 5:32 pm Post subject: Apr 3 VH |
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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
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| Posted: Sat Apr 03, 2010 7:15 pm Post subject: |
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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
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| Posted: Sat Apr 03, 2010 7:25 pm Post subject: |
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.
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 |
+--------------+-----------------+---------------+
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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
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| Posted: Sat Apr 03, 2010 7:59 pm Post subject: |
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| 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 |
+--------------+-----------------+---------------+
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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
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| Posted: Sat Apr 03, 2010 8:35 pm Post subject: |
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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
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| Posted: Sun Apr 04, 2010 12:25 am Post subject: |
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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
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| Posted: Mon Apr 05, 2010 11:04 am Post subject: Re: Apr 3 VH |
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| 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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