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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Dec 12, 2009 7:54 pm Post subject: Puzzle NR 09/12/12 BBDB |
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| Code: | +-----------------------+
| 1 . . | . . . | . 3 . |
| . 8 . | 6 2 . | . . . |
| . . 6 | 1 . . | . 4 . |
|-------+-------+-------|
| . 6 9 | . . 2 | . . . |
| . 3 . | . 7 4 | . 6 8 |
| . . . | 8 6 . | . . . |
|-------+-------+-------|
| . . . | . . . | . 2 9 |
| 6 . 4 | . 3 . | 5 8 . |
| . . . | . 9 . | 6 . 3 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Dec 12, 2009 10:51 pm Post subject: |
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Taking them as I found them, I had six steps.
w-wing 17 with transport,
ER 7.
finned x-wing 7,
skyscraper on 5,
xy-wing -579,
AIC found by extending the vertex of a potential xy-wing 5-79.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Dec 14, 2009 1:55 am Post subject: |
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I also used six steps.
W (17)
Coloring (7)
W (15)
XY (795)
Coloring (9)
M (79) with pincer transport |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Dec 14, 2009 2:10 am Post subject: |
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| It appears that the <25> UR Type 1 was more troublesome than expected. I expected the initial eliminations on <7> to be the big stumbling block. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Dec 14, 2009 2:28 am Post subject: |
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| Quote: | | I expected the initial eliminations on <7> to be the big stumbling block. |
Isn't it more fun when the unexpected occurs?
| Quote: | | It appears that the <25> UR Type 1 was more troublesome than expected. |
Apparently so; I don't recall seeing any such UR. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Dec 14, 2009 2:33 am Post subject: |
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| Marty R. wrote: | | Quote: | | I expected the initial eliminations on <7> to be the big stumbling block. |
Isn't it more fun when the unexpected occurs?
| Quote: | | It appears that the <25> UR Type 1 was more troublesome than expected. |
Apparently so; I don't recall seeing any such UR. |
Yes ... 
Sequence that exposes UR Type 1:
| Code: | c4b1 Empty Rectangle <> 7 r7c2
<57+1> XY-Wing r7c4/r7c2+r8c6 <> 1 r7c5
r8c8 2-String Kite <> 7 r2c6
c68 X-Wing <> 9 r2c7 -or-
r15 X-Wing <> 9 r2c7
r19c23 <25> UR Type 1 <> 25 r9c3
BUG+1 = 7 r9c6
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