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Pat
Joined: 23 Feb 2010
Posts: 207
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 Posted: Tue Dec 27, 2011 12:43 pm Post subject: gsf # 160 # 9 |
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...8..6...2.9.5.......17..597.....5...5...2...1.....837..14.......3.2.4...6..9...
[ play ] | Code: |
. . . | 8 . . | 6 . .
. 2 . | 9 . 5 | . . .
. . . | . 1 7 | . . 5
-------+-------+------
9 7 . | . . . | . 5 .
. . 5 | . . . | 2 . .
. 1 . | . . . | . 8 3
-------+-------+------
7 . . | 1 4 . | . . .
. . . | 3 . 2 | . 4 .
. . 6 | . . 9 | . . .
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a splendid puzzle -- and certainly does not deserve the rating "too hard" |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Tue Dec 27, 2011 12:49 pm Post subject: |
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Nice puzzle. I liked the way it started!  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 27, 2011 7:03 pm Post subject: |
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XY-Wing (346); r456c5<>6.
Was that one step too many? I saw stuff after the fact that made me wonder. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Dec 27, 2011 8:37 pm Post subject: |
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| Marty R. wrote: | XY-Wing (346); r456c5<>6.
Was that one step too many? I saw stuff after the fact that made me wonder. |
Marty,
If you look closely at R6 and B5 you will find a pair 46 in B5 and a triple 246 in R5. The XY-wing is not needed.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 27, 2011 8:41 pm Post subject: |
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| I discovered that when I played it again, this time on Draw/Play. I don't know if the puzzle is solvable by basics only, but on Draw/Play I needed a Type 1 UR (57). |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Tue Dec 27, 2011 8:54 pm Post subject: |
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| Marty R. wrote: | | I discovered that when I played it again, this time on Draw/Play. I don't know if the puzzle is solvable by basics only, but on Draw/Play I needed a Type 1 UR (57). |
Marty,
According to Sudoku Susser:
1 x Comprehensive Naked Sets
1 x Intersection Removal
6 x Simple Naked Sets
12 x Pinned Squares
The last trick is to find a pair 13 in R9. You do not need the very obvious UR.
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Dec 27, 2011 10:31 pm Post subject: |
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I do recall a 13 pair. It seems that every time I do a puzzle I get a different result. 
Thanks. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed Dec 28, 2011 1:24 am Post subject: |
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| Marty R. wrote: | I do recall a 13 pair. It seems that every time I do a puzzle I get a different result.
Thanks. |
Marty, It's the journey.
I presume you get the same result, but perhaps by a different path.
Happy New Year!
Keith |
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