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Puzzle 10/02/05 (B)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Fri Feb 05, 2010 7:36 am    Post subject: Puzzle 10/02/05 (B) Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Fri Feb 05, 2010 7:11 pm    Post subject: Reply with quote

My first "2 and 3/8" steps did the trick.

AIC found, as usual for me, looking for xy-wings:
(4=2)r8c3 - (2=5)r9c2 - r9c1 = r5c1 - (5=2)r5c7 - r46c8 = r9c8 - (2=4)r7c9; r7c3<>4.

This sets up a finned xy-wing with the vertex and fin both being in r4c3.
If the xy-wing 25-7 is true: vertex 25 in r4c3 with pincers 57 in r5c1 and 27 in r7c3 delete 7 in r56c3 and r9c1.
If fin is true: only the 7 in r56c3 is deleted.

Then, transporting (7)r7c3 - r7c5 = (7)r6c5 deletes 7 in r5c4 to complete the puzzle.

Ted

PS: Please note that Marty suggested that transports count as a "3/8" step.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Fri Feb 05, 2010 7:53 pm    Post subject: Reply with quote

Best I could do was 4 steps:

xy-wing 527
x-wing 2
kite 3
kite 2

Sad
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Fri Feb 05, 2010 9:29 pm    Post subject: Reply with quote

arkietech wrote:
Best I could do was 4 steps:

xy-wing 527
x-wing 2
kite 3
kite 2

Sad

Why the sad face? I see a very nice solution using VH and VH+ techniques.

Regards, Danny
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sat Feb 06, 2010 12:52 am    Post subject: Reply with quote

Three steps for me:
XY 257
Skyscraper 2 (which knocked out four "2s" -- sweet!)
X 2
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Feb 06, 2010 2:20 am    Post subject: Reply with quote

Wendy W wrote:
Skyscraper 2 (which knocked out four "2s" -- sweet!)


Missing that one makes me sad Sad

Nice find Wendy!
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Feb 06, 2010 2:20 am    Post subject: Reply with quote

ERs (2,3)
W (24)
Finned X-Wing (2)
XY (257)
W (25)
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Wendy W



Joined: 04 Feb 2008
Posts: 144

PostPosted: Sat Feb 06, 2010 3:35 pm    Post subject: Reply with quote

Thanks, Dan! Very Happy
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