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Set G Puzzle 60

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Dec 19, 2008 6:23 am    Post subject: Set G Puzzle 60 Reply with quote

Code:
 +-----------------------+
 | 7 . . | . . . | 8 1 . |
 | . 8 . | . . . | . . . |
 | . . 9 | . 8 . | 7 4 6 |
 |-------+-------+-------|
 | . . . | 8 . . | 5 . . |
 | . . 8 | . . 7 | . 6 . |
 | . . . | . 3 . | 9 7 . |
 |-------+-------+-------|
 | 1 . 7 | 3 . 8 | 4 2 . |
 | 9 . 2 | . 5 1 | 3 . 7 |
 | . . 3 | . . . | . 5 . |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Fri Dec 19, 2008 8:32 am    Post subject: Reply with quote

I have a question about a M-wing in this puzzle and if the elimination can be verified...

Code:
.------------------------.------------------------.------------------------.
| 7       23*     456    | 269     249     234569 | 8       1       35     |
| 456     8       1456   | 167     147     3456   | 2       9       35     |
|-25     M123*    9      |M12      8       235    | 7       4       6      |
:------------------------+------------------------+------------------------:
| 246     7       146    | 8       1249    2469   | 5       3       24     |
| 3       9       8      | 5       24      7      | 1       6       24     |
| 2456   M12      1456   | 126     3       246    | 9       7       8      |
:------------------------+------------------------+------------------------:
| 1       5       7      | 3       6       8      | 4       2       9      |
| 9       6       2      | 4       5       1      | 3       8       7      |
| 8       4       3      | 279     279     29     | 6       5       1      |
'------------------------'------------------------'------------------------'

the M-wing in question is marked in the cells above and as follows.
(2=1)r3c4 - (1)r3c2 = (1-2)r6c2 = (2)r13c2; r3c1 <> 2

I don't like folding chains over themselves. in this, one of the 2's in the last link occupy the same cell as the 1 in the second link. so because it folded over just a little, is it still valid?
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nataraj



Joined: 03 Aug 2007
Posts: 1029
Location: Vienna, Austria

PostPosted: Fri Dec 19, 2008 8:43 am    Post subject: Reply with quote

I can see no problem with the reasoning, nor the elimination.

(BTW, you could have used the grouped strong link (2)r6c2=r46c1 instead of the one in col 2 and still arrived at the same result).
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Fri Dec 19, 2008 8:57 am    Post subject: Reply with quote

nataraj wrote:
I can see no problem with the reasoning, nor the elimination.

(BTW, you could have used the grouped strong link (2)r6c2=r46c1 instead of the one in col 2 and still arrived at the same result).


now why didn't I see that? I am convinced there is a reason why I didn't see that.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Fri Dec 19, 2008 3:14 pm    Post subject: Reply with quote

since the vh was so easy today I tried this one. - a ur, an x, xy and xyz wing, topped off with a bug+1. Probably one of those would have done but....
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Fri Dec 19, 2008 3:59 pm    Post subject: Reply with quote

nataraj wrote:

(BTW, you could have used the grouped strong link (2)r6c2=r46c1 instead of the one in col 2 and still arrived at the same result).


Still another way to get the same result is the xyz-wing <123> with pivot at r3c2 and pincers at r1c2 and r3c4.

Ted
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