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FP February 13th

 
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Fri Feb 13, 2009 4:22 pm    Post subject: FP February 13th Reply with quote
Easier than most of the Friday puzzles. Sad

Code:
. 8 3|4 . 2|. 1 .
5 . .|. . .|. 9 .
. . .|1 . 5|3 . .
-----+-----+-----
. 7 .|. . .|. . 5
1 . .|. . .|. . 9
2 . .|. . .|. 4 .
-----+-----+-----
. . 4|. . 1|. . .
. 1 .|. . .|9 . 8
. 3 .|8 . 7|1 6 .
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Fri Feb 13, 2009 6:04 pm    Post subject: Reply with quote
Code:
.---------------.---------------.---------------.
| 67   8    3   | 4    9    2   | 5    1    67  |
| 5    2    1   | 37   8    36  | 4    9    67  |
| 4    9    67  | 1    67   5   | 3    8    2   |
:---------------+---------------+---------------:
| 3    7    9   | 6    1    4   | 8    2    5   |
| 1    4   *56  |*257 2-7*  8   | 67   3    9   |
| 2    56   8   |*57   3    9   | 67   4    1   |
:---------------+---------------+---------------:
| 8    56   4   | 9    56   1   | 2    7    3   |
| 67   1    267 | 23   4    36  | 9    5    8   |
| 9    3   *25  | 8   *25   7   | 1    6    4   |
'---------------'---------------'---------------'

Quote:
its still a nice puzzle
surprising no xy-wings are present with so many bi-value cells.
(7=5)r6c4 - (5)r5c4 = (5)r5c3 - (5=2)r9c3 - (2)r9c5 = (2)r5c5; r5c5 <> 7
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ronk



Joined: 07 May 2006
Posts: 398
PostPosted: Fri Feb 13, 2009 6:18 pm    Post subject: Reply with quote
Quote:
BUG+2: (7)r5c4 = (6)r8c3 - (6=3)r8c6 - (3=2)r8c4 ==> r5c4<>2
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Feb 13, 2009 7:56 pm    Post subject: Reply with quote
I used coloring to make an elimination in R8C3, reducing it it to a BUG+1 in R5C4.

Keith
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Feb 14, 2009 1:01 am    Post subject: Reply with quote
[quote="storm_norm"]
Code:
.---------------.---------------.---------------.
| 67   8    3   | 4    9    2   | 5    1    67  |
| 5    2    1   | 37   8    36  | 4    9    67  |
| 4    9    67  | 1    67   5   | 3    8    2   |
:---------------+---------------+---------------:
| 3    7    9   | 6    1    4   | 8    2    5   |
| 1    4   *56  |*257 2-7*  8   | 67   3    9   |
| 2    56   8   |*57   3    9   | 67   4    1   |
:---------------+---------------+---------------:
| 8    56   4   | 9    56   1   | 2    7    3   |
| 67   1    267 | 23   4    36  | 9    5    8   |
| 9    3   *25  | 8   *25   7   | 1    6    4   |
'---------------'---------------'---------------'

Quote:

surprising no xy-wings are present with so many bi-value cells.


Actually, a useless xy-wing exists on <257> with pivot <27> at r5c5 and pincers <57> at r6c4 and <25> at r9c5. Transporting the <5> from r9c5 to r7c2 via r9c3 deletes the <5> at r6c2 and completes the puzzle.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 14, 2009 1:17 am    Post subject: Reply with quote
Quote:
Actually, a useless xy-wing exists on <257> with pivot <27> at r5c5 and pincers <57> at r6c4 and <25> at r9c5. Transporting the <5> from r9c5 to r7c2 via r9c3 deletes the <5> at r6c2 and completes the puzzle.

OK, time for the language police to check in. "Useless"? Wink
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Feb 14, 2009 2:04 am    Post subject: Reply with quote
Marty R. wrote:
Quote:
Actually, a useless xy-wing exists on <257> with pivot <27> at r5c5 and pincers <57> at r6c4 and <25> at r9c5. Transporting the <5> from r9c5 to r7c2 via r9c3 deletes the <5> at r6c2 and completes the puzzle.

OK, time for the language police to check in. "Useless"? Wink


So, terminology always seems to be the biggest problem when we describe how we solve these puzzles. In this case, I thought I was using a term previously used by other members to indicate a condition were the original pattern did not provide a deletion but transportation, extension or coloring did.

I agree it is a funny use of the term, and would be happy to use a different one. What do you suggest?

Ted Cool
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Feb 14, 2009 2:10 am    Post subject: Reply with quote
tlanglet wrote:
Marty R. wrote:
Quote:
Actually, a useless xy-wing exists on <257> with pivot <27> at r5c5 and pincers <57> at r6c4 and <25> at r9c5. Transporting the <5> from r9c5 to r7c2 via r9c3 deletes the <5> at r6c2 and completes the puzzle.

OK, time for the language police to check in. "Useless"? Wink


So, terminology always seems to be the biggest problem when we describe how we solve these puzzles. In this case, I thought I was using a term previously used by other members to indicate a condition were the original pattern did not provide a deletion but transportation, extension or coloring did.

I agree it is a funny use of the term, and would be happy to use a different one. What do you suggest?

Ted Cool

Well, of course, I was just yankin' your chain. However, when the wing's original pincers eliminate nothing, I've seen them referred to as "flightlesss." But I'm not necessarily suggesting that you use that. Very Happy
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Feb 14, 2009 3:01 am    Post subject: Reply with quote
I prefer a PM.

Code:
 XY-Wing  a-b-c w/transport d-e  =>  [r6c2]<>5   -or-
 XY-Wing  a-b-c w/transport D-e  =>  [r6c2]<>5   -or-
 XY-Chain a-b-c-            D-e  =>  [r6c2]<>5
 *---------------------------------------------------*
 | 67   8    3    |  4    9    2    | 5    1    67   |
 | 5    2    1    |  37   8    36   | 4    9    67   |
 | 4    9    67   |  1    67   5    | 3    8    2    |
 |----------------+-----------------+----------------|
 | 3    7    9    |  6    1    4    | 8    2    5    |
 | 1    4    56   |  257 b27   8    | 67   3    9    |
 | 2    6-5  8    | a57   3    9    | 67   4    1    |
 |----------------+-----------------+----------------|
 | 8   e56   4    |  9   D56   1    | 2    7    3    |
 | 67   1    267  |  23   4    36   | 9    5    8    |
 | 9    3   d25   |  8   c25   7    | 1    6    4    |
 *---------------------------------------------------*


Last edited by daj95376 on Sat Feb 14, 2009 3:12 am; edited 1 time in total
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Sat Feb 14, 2009 3:07 am    Post subject: Reply with quote
A single W-wing does it, too.

Code:
.---------------.---------------.---------------.
| 67   8    3   | 4    9    2   | 5    1    67  |
| 5    2    1   | 37   8    36  | 4    9    67  |
| 4    9   #67  | 1   *67   5   | 3    8    2   |
:---------------+---------------+---------------:
| 3    7    9   | 6    1    4   | 8    2    5   |
| 1    4    5-6 | 257 *27   8   |#67   3    9   |
| 2    56   8   | 57   3    9   | 67   4    1   |
:---------------+---------------+---------------:
| 8    56   4   | 9    56   1   | 2    7    3   |
| 67   1    267 | 23   4    36  | 9    5    8   |
| 9    3    25  | 8    25   7   | 1    6    4   |
'---------------'---------------'---------------'


Last edited by wapati on Sat Feb 14, 2009 1:17 pm; edited 1 time in total
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Sat Feb 14, 2009 7:10 am    Post subject: Reply with quote
wapati wrote:
A single W-wing does it, too.

I see an extended W-wing that does it,
and a M-wing {2,5} which has those sultry solving eyes.
happy v-day everyone.
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