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Puzzle NR 09/12/09 (A)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Wed Dec 09, 2009 10:51 am    Post subject: Puzzle NR 09/12/09 (A) Reply with quote
Code:
 +-----------------------+
 | . 8 . | 9 . . | . . 3 |
 | 5 . 6 | 8 . . | 4 7 . |
 | . 9 . | . 5 4 | . 1 8 |
 |-------+-------+-------|
 | 3 5 . | 7 . 2 | . . . |
 | . . 4 | . 8 . | . . . |
 | . . 1 | 4 . 5 | . . . |
 |-------+-------+-------|
 | . 6 . | . . . | 8 . . |
 | . 3 7 | . . . | . 6 . |
 | 8 . 5 | . . . | . . 7 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

3-Stepper wrote:
<17> UR Type 1, Skyscraper 9, <23+7> XY-Wing.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Wed Dec 09, 2009 2:19 pm    Post subject: Reply with quote
three stepper;
Quote:
skyscraper 9
xy-wing 237
w-wing 19
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Dec 10, 2009 6:01 am    Post subject: Reply with quote
Type 1 UR (17), ER (9), which was probably the skyscraper mentioned above, and XY-Wing (237).
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Fri Dec 11, 2009 4:30 pm    Post subject: Reply with quote
Another three step with a small variation.

type 1 UR 17,
AIC found by extending the vertex of a potential xy-wing: (4=9)r4c8 - (9=1)r4c7 - (1)r4c5 = (1-3)r5c4 = (3)r79c4 - (3=4)r7c5; r7c8<>4
xy-wing -237

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Dec 11, 2009 5:11 pm    Post subject: Reply with quote
tlanglet wrote:
Another three step with a small variation.

Unfortunately, yes. Sad

I seem to have run into a batch of puzzles with little opportunity for variation in the solution path. I'm not sure if it's related to the short number of steps or the lack of reasonable alternatives for each step. However, if a puzzle has too many alternatives, then a person can get bogged down with unproductive eliminations.

I have a small number of puzzles left in each of my current puzzle files. I'm also in the midst of tweaking my (very limited) puzzle generator. Maybe the next bach of puzzles will allow more originality!

Regards, Danny
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