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Puzzle "Because It's so Rare (for me)"

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jul 12, 2009 6:50 am    Post subject: Puzzle "Because It's so Rare (for me)" Reply with quote
Code:
 +-----------------------+
 | 3 . . | . . 5 | 7 . . |
 | . 5 . | . 7 . | . 4 6 |
 | . . 4 | 2 3 . | . . 8 |
 |-------+-------+-------|
 | . . 8 | . . 3 | . . . |
 | . 1 7 | . 2 . | . . . |
 | 5 . . | 6 . 7 | . . . |
 |-------+-------+-------|
 | 7 . . | . . . | 6 . . |
 | . 6 . | . . . | . 8 . |
 | . 8 1 | . . . | . . 2 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Jul 12, 2009 9:07 pm    Post subject: Reply with quote
After "basics":

Code:
+----------------------+----------------------+----------------------+
| 3      9      6      | 48     48     5      | 7      2      1      |
| 8      5      2      | 19     7      19     | 3      4      6      |
| 1      7      4      | 2      3      6      | 9      5      8      |
+----------------------+----------------------+----------------------+
| 2469   24     8      | 1459   1459   3      | 124    1679   4579   |
| 469    1      7      | 4589   2      489    | 48     369    3459   |
| 5      234    39     | 6      1489   7      | 1248   19     49     |
+----------------------+----------------------+----------------------+
| 7      234    359    | 134589 14589  12489  | 6      139    349    |
| 249    6      359    | 134579 1459   1249   | 14     8      3479   |
| 49     8      1      | 37     6      49     | 5      37     2      |
+----------------------+----------------------+----------------------+


Quote:
If you don't see the naked / hidden sets, this one is really tough! Hint: It's in one of the boxes.
Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jul 12, 2009 10:31 pm    Post subject: Reply with quote
keith wrote:
After "basics":

Code:
+----------------------+----------------------+----------------------+
| 3      9      6      | 48     48     5      | 7      2      1      |
| 8      5      2      | 19     7      19     | 3      4      6      |
| 1      7      4      | 2      3      6      | 9      5      8      |
+----------------------+----------------------+----------------------+
| 2469   24     8      | 1459   1459   3      | 124    1679   4579   |
| 469    1      7      | 4589   2      489    | 48     369    3459   |
| 5      234    39     | 6      1489   7      | 1248   19     49     |
+----------------------+----------------------+----------------------+
| 7      234    359    | 134589 14589  12489  | 6      139    349    |
| 249    6      359    | 134579 1459   1249   | 14     8      3479   |
| 49     8      1      | 37     6      49     | 5      37     2      |
+----------------------+----------------------+----------------------+


Quote:
If you don't see the naked / hidden sets, this one is really tough! Hint: It's in one of the boxes.
Keith

I was hopelessly stuck after nothing more than a worthless Hidden UR. Shame on me, two dozen lashes with a wet noodle, I missed that subset, after which no more than basics finished it off. So it was a "zero-stepper."

Is that what was so rare for Danny?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Mon Jul 13, 2009 4:40 am    Post subject: Reply with quote
Marty,

I am not sure of the terminology, but a 5-candidate naked set plus a complementary 4-candidate hidden set seems pretty rare to me!

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jul 13, 2009 5:16 am    Post subject: Reply with quote
keith wrote:
Marty,

I am not sure of the terminology, but a 5-candidate naked set plus a complementary 4-candidate hidden set seems pretty rare to me!

Keith

Keith,

They don't seem that rare to me. Of course, I ignore hidden sets because they're impossible for me to spot, and why bother when there's an easier-to-spot naked set? I haven't kept counts, but I've seen a number of quints, my terminology for a 5-candidate subset.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jul 13, 2009 12:03 pm    Post subject: Reply with quote
Marty R. wrote:
I was hopelessly stuck after nothing more than a worthless Hidden UR. Shame on me, two dozen lashes with a wet noodle, I missed that subset, after which no more than basics finished it off. So it was a "zero-stepper."

Is that what was so rare for Danny?

Hello Marty,

Yes, I consider a Hidden Quad to be rare. Mike Barker posted (elsewhere) the statistical frequency of various techniques from a lare sample set of puzzles. If I recall correctly, the Hidden Quad had a low frequency in his results.

Regards, Danny
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