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July 12 BrainBashers

 
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Jul 12, 2009 9:42 pm    Post subject: July 12 BrainBashers Reply with quote
Code:



 *-----------*
 |..1|6.2|3..|
 |...|.5.|...|
 |8..|391|..5|
 |---+---+---|
 |739|..5|6.2|
 |265|9..|74.|
 |148|2..|953|
 |---+---+---|
 |612|784|539|
 |...|12.|8..|
 |.87|5.9|12.|
 *-----------*
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Mon Jul 13, 2009 1:50 am    Post subject: Reply with quote
UR type 3
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jul 13, 2009 3:10 am    Post subject: Reply with quote
I don't see a lot of useful Type 3 URs but in this case it does the trick.

However, when I ignored the UR, it became a difficult puzzle for me to solve.

Ted
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
PostPosted: Mon Jul 13, 2009 11:37 am    Post subject: Reply with quote
Ted, I think you may have overlooked a W-Wing.

Code:
+-------------------------------------+
| 459 579 1   | 6  47  2  | 3  89 78  |
| 349 279 346 | 48 5   78 | 24 19 167 |
| 8   27  46  | 3  9   1  | 24 67 5   |
---------------------------------------
| 7   3   9   | 48 14  5  | 6  18 2   |
| 2   6   5   | 9  13  38 | 7  4  18  |
| 1   4   8   | 2  67  67 | 9  5  3   |
---------------------------------------
| 6   1   2   | 7  8   4  | 5  3  9   |
| 59  59  34  | 1  2   36 | 8  67 467 |
| 34  8   7   | 5  36  9  | 1  2  46  |
+-------------------------------------+

The candidates (78) in r1c9 and r2c6 line up with the conjugates for 8 in row 5 so one of these two cells must contain 7.

The elimination of 7 from r1c5 solves the puzzle.

Steve
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jul 13, 2009 12:56 pm    Post subject: Reply with quote
Steve R wrote:
Ted, I think you may have overlooked a W-Wing.


Thanks Steve, you nailed it Exclamation I paid the price of overlooking it by working longer until I finally found a xy-chain, which is unusual for a BrainBuster..

Ted
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