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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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 Posted: Sun Mar 22, 2009 5:00 pm Post subject: MM 1351 march 22 |
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| Code: |
+-------+-------+-------+
| . 8 . | 6 . . | . 3 . |
| . . 5 | . . 2 | 4 7 . |
| . . . | . 1 8 | 2 . . |
+-------+-------+-------+
| . . . | . . 3 | . 1 . |
| 5 . . | . . . | . . 4 |
| . 1 . | 8 . . | . . . |
+-------+-------+-------+
| . . 8 | 9 7 . | . 2 . |
| . . 6 | 1 . . | 3 . . |
| . 7 . | . . . | . 8 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Mar 22, 2009 6:04 pm Post subject: |
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Interesting! My final PM resembles a BUG+2, but I can't get it to work as a BUG+2 in my head.
| Code: | +-----------------------------------------------------+
| 2 8 49 | 6 45 7 | 159 3 15 |
| 1 6 5 | 3 9 2 | 4 7 8 |
| 7 34 39 | 45 1 8 | 2 69 569 |
|-----------------+-----------------+-----------------|
| 8 49 7 | 45 56 3 | 69 1 2 |
| 5 39 23 | 7 26 1 | 8 69 4 |
| 6 1 24 | 8 24 9 | 7 5 3 |
|-----------------+-----------------+-----------------|
| 3 5 8 | 9 7 4 | 16 2 16 |
| 9 2 6 | 1 8 5 | 3 4 7 |
| 4 7 1 | 2 3 6 | 59 8 59 |
+-----------------------------------------------------+
# 25 eliminations remain
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Last edited by daj95376 on Sun Mar 22, 2009 11:15 pm; edited 1 time in total |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Mar 22, 2009 8:36 pm Post subject: |
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Norm,
Are you trying to make me happy?
Edit: After an X-wing 4, an XY-wing -239 and an XYZ-wing 56-9
I get to here:
| Code: | +-------------+-------------+-------------+
| 2 8 49 | 6 45 7 | 159 3 15 |
| 1 6 5 | 3 9 2 | 4 7 8 |
| 7 349 39 | 45 1 8 | 2 69 569 |
+-------------+-------------+-------------+
| 8 49 7 | 45 56 3 | 69 1 2 |
| 5 39 239 | 7 26 1 | 8 69 4 |
| 6 1 24 | 8 24 9 | 7 5 3 |
+-------------+-------------+-------------+
| 3 5 8 | 9 7 4 | 16 2 16 |
| 9 2 6 | 1 8 5 | 3 4 7 |
| 4 7 1 | 2 3 6 | 59 8 59 |
+-------------+-------------+-------------+ |
There is a hidden UR <39> in R35C23. R3C3 and R5C2 must be <3>. This opens up a skyscraper which takes out <9> in R1C7. The puzzle is toast!
Edit: Deleted incorrect comment on the BUG+2.
Keith |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Mon Mar 23, 2009 1:09 am Post subject: |
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| daj95376 wrote: | Interesting! My final PM resembles a BUG+2, but I can't get it to work as a BUG+2 in my head.
| Code: | +-----------------------------------------------------+
| 2 8 49 | 6 45 7 | 159 3 15 |
| 1 6 5 | 3 9 2 | 4 7 8 |
| 7 34 39 | 45 1 8 | 2 69 569 |
|-----------------+-----------------+-----------------|
| 8 49 7 | 45 56 3 | 69 1 2 |
| 5 39 23 | 7 26 1 | 8 69 4 |
| 6 1 24 | 8 24 9 | 7 5 3 |
|-----------------+-----------------+-----------------|
| 3 5 8 | 9 7 4 | 16 2 16 |
| 9 2 6 | 1 8 5 | 3 4 7 |
| 4 7 1 | 2 3 6 | 59 8 59 |
+-----------------------------------------------------+
# 25 eliminations remain
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Danny,
The Deadly Pattern is such that every unsolved cell has two candidates, and that each candidate exists exactly twice in each row, column and box.
I cannot see a potential DP here.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Mar 29, 2009 4:38 am Post subject: |
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| Quote: | | There is a hidden UR <39> in R35C23. R3C3 and R5C2 must be <3>. |
Keith, there's nothing hidden, it's a full Type 6. I actually used seven ordinary moves, with the Type 6 and coloring on 9 as the last two. That last coloring takes out the same 9 as your skyscraper. I probably had the skyscraper and didn't notice it. |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Mar 29, 2009 8:15 pm Post subject: |
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I'm strangely stuck here. I used the x-wings on 4, an xy wing on 249 and and ER on 9 and have actually gone further than Keith's grid - in R3C2 I just have a 34 and in R5C3 a 23. As such I can't see any UR.
BUT I still have a 159 in R1C9. How did the 9 get removed? |
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Steve R
Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England
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| Posted: Sun Mar 29, 2009 8:45 pm Post subject: |
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Keith referred to an XYZ-wing 56-9.
I suspect this is pivoted on r3c9 and does the trick.
Steve |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Mar 29, 2009 8:58 pm Post subject: |
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| Quote: | Keith referred to an XYZ-wing 56-9.
I suspect this is pivoted on r3c9 and does the trick.
Steve |
Yes, quite! Thank you. Though still don't see last move - the colouring doesn't seem to work. |
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