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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Mon Feb 16, 2009 2:05 am Post subject: NoName Puzzle 75 -- Advanced |
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| Code: | +-----------------------+
| 5 . 2 | 3 . . | . 4 . |
| . 7 . | 4 . . | 8 . . |
| 6 . 4 | 5 7 . | . . . |
|-------+-------+-------|
| 9 2 6 | . 5 1 | . . . |
| . . 1 | 2 3 . | . . . |
| . . . | 7 . . | . 2 . |
|-------+-------+-------|
| . 3 . | . . . | 2 . . |
| 2 . . | . . 7 | . 5 . |
| . . . | . . . | . . 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
===== ===== ===== ===== ===== ===== ===== ===== ===== Ratings are Accumulative
Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2
Basics+: Naked Quad, Hidden Pair/Triple/Quad
VH: BUG+1, UR Type 1, X-Wing, XY-Wing, XYZ-Wing
VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, Colors, UR Type 2, finned/Sashimi X-Wing
Advanced: Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain
Extreme: Jellyfish, (but mostly) Chain |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Feb 16, 2009 6:53 am Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 5 189 2 | 3 169 M689 | 679 4 -679 |
| 13 7 39 | 4 169 2 | 8 169 5 |
| 6 189 4 | 5 7 89 | 39 139 2 |
:---------------------+---------------------+---------------------:
| 9 2 6 | 8 5 1 | 347 37 347 |
| 7 4 1 | 2 3 M69 | 5 689 689 |
| 38 5 38 | 7 M69 4 | 1 2 M69 |
:---------------------+---------------------+---------------------:
|M148 3 7 | 169 M48 5 | 2 6-89 46-89 |
| 2 169 89 | 169 48 7 | 3469 5 34689 |
|M48 69 5 | 69 2 3 | 47 M78 1 |
'---------------------'---------------------'---------------------' |
m-wing {6,9} starting in r6c9, eliminates the 6 in r1c9
m-wing {4,8} starting in r7c5, eliminates the 8's in r7c89
with those 8's gone in box 9... we can now form the strong-wing that elimintes the 3 in r4c8 and solves the puzzle.
3's are conjugate in column 9, (to form on side of the rectangle)
8's are conjugate in box 9, (another side)
7's are conjugate in column 8, (third side)
the last 7 shares the cell with a 3 and the 3 can be eliminated from r4c8.
(3)r4c9 = (3-8)r8c9 = (8-7)r9c8 = (7)r4c8; r4c8 <> 3 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 18, 2009 5:44 am Post subject: |
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| The Type 4 UR on 48 leaves r5c9 as the only remaining 8 in c9. A Hidden UR on 69 eliminates a candidate but has no effect. Then an ER on 6 solves r5c8 = 9 which finishes it. |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Wed Feb 18, 2009 4:20 pm Post subject: |
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| Marty R. wrote: | | The Type 4 UR on 48 leaves r5c9 as the only remaining 8 in c9. A Hidden UR on 69 eliminates a candidate but has no effect. Then an ER on 6 solves r5c8 = 9 which finishes it. |
I'm not seeing the 48 UR but I do see the ER you mention, if 8 is assumed for r5c9. The only hidden UR I do see is on 89s and it is visible earlier and doesn't help much.
| Code: | .--------------.---------------.------------------.
| 5 *18-9 2 | 3 169 *689 | 679 4 679 |
| 13 7 39 | 4 169 2 | 8 169 5 |
| 6 *189 4 | 5 7 *89 | 39 139 2 |
:--------------+---------------+------------------:
| 9 2 6 | 8 5 1 | 347 37 347 |
| 7 4 1 | 2 3 69 | 5 689 689 |
| 38 5 38 | 7 69 4 | 1 2 69 |
:--------------+---------------+------------------:
| 148 3 7 | 169 48 5 | 2 689 4689 |
| 2 169 89 | 169 48 7 | 3469 5 34689 |
| 48 69 5 | 69 2 3 | 47 78 1 |
'--------------'---------------'------------------' |
Another coffee for one of us? 
I know I need one to sort through Norm's solution.  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 18, 2009 5:33 pm Post subject: |
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| Quote: | | I'm not seeing the 48 UR but I do see the ER you mention, if 8 is assumed for r5c9. The only hidden UR I do see is on 89s and it is visible earlier and doesn't help much. |
My unhelpful Hidden UR was based on the strong link on 6 in column 2 for the 69 UR.
As to the Type 4 on 48, I probably made a mistake or else had a different grid, but I did play it as if there was a strong link on 4 in column 9, thus eliminating the 8s.
I'll take another shot at it. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Feb 18, 2009 7:44 pm Post subject: |
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| Quote: | As to the Type 4 on 48, I probably made a mistake or else had a different grid, but I did play it as if there was a strong link on 4 in column 9, thus eliminating the 8s.
I'll take another shot at it. |
And after that 2nd shot, I conclude that I screwed up. |
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