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Free Press May 15, 2009

 
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri May 15, 2009 3:29 pm    Post subject: Free Press May 15, 2009 Reply with quote
I enjoyed this one.
Code:
Puzzle: FP051509
+-------+-------+-------+
| . . . | . . . | 6 . . |
| . 4 . | 1 . 3 | 7 . . |
| . . . | 5 . 6 | . 2 . |
+-------+-------+-------+
| 2 . . | 3 . 5 | . . 1 |
| 4 . . | . . . | . . 3 |
| 1 5 . | 2 . 8 | . . 6 |
+-------+-------+-------+
| . . . | 7 . . | . . . |
| . . 8 | . . 2 | . 1 . |
| . . 5 | . . . | . . . |
+-------+-------+-------+

Hint: When you find a cell that is <9>, I believe you are done.

Keith
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Fri May 15, 2009 4:39 pm    Post subject: Reply with quote
I like ERs, so this was good for me. Two ERs get rid of the <7> and <9> in R5C3.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Fri May 15, 2009 6:29 pm    Post subject: Reply with quote
I used a skyscraper 7 to solve it in one step.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri May 15, 2009 8:00 pm    Post subject: Reply with quote
Coloring does not seem to come up much in the discussions on this forum.
arkietech wrote:
I used a skyscraper 7 to solve it in one step.
Much the same thing, but if you use coloring on <7> you reach a contradiction, and this immediately solves all except two of the cells containing <7>.
Code:
+----------------+----------------+----------------+
| 5   b79   1    | 489  2   4a79  | 6    3    89   |
| 6    4    2    | 1    89   3    | 7    89   5    |
| 8    3   a79   | 5   b79   6    | 1    2    4    |
+----------------+----------------+----------------+
| 2   a79   679  | 3    4679 5    | 489  4789 1    |
| 4    8   6a79  | 69   1   b79   | 2    5    3    |
| 1    5    3    | 2    479  8    | 49   479  6    |
+----------------+----------------+----------------+
| 39   12   4    | 7    3568 19   | 3589 689  289  |
| 379  6    8    | 49   35   2    | 3459 1    79   |
| 379  12   5    | 68   368  149  | 3489 4689 2789 |
+----------------+----------------+----------------+

The cells marked "a" cannot be <7>, since there are two in B4. "b" is <7>, as is R4C3 in B4, etc.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Fri May 15, 2009 11:31 pm    Post subject: Reply with quote
I used Remote Pairs on 79, coloring on 7 and an XY-Wing on 694 with pincer transport.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat May 16, 2009 11:59 am    Post subject: Reply with quote
arkietech wrote:
I used a skyscraper 7 to solve it in one step.

Ditto.

Ted
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