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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Dec 19, 2008 6:23 am Post subject: Set G Puzzle 60 |
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| 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 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Dec 19, 2008 8:32 am Post subject: |
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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: 1048
Location: near Vienna, Austria
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| Posted: Fri Dec 19, 2008 8:43 am Post subject: |
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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
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| Posted: Fri Dec 19, 2008 8:57 am Post subject: |
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| 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
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| Posted: Fri Dec 19, 2008 3:14 pm Post subject: |
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| 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: 2468
Location: Northern California Foothills
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| Posted: Fri Dec 19, 2008 3:59 pm Post subject: |
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| 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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