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daj95376
Joined: 23 Aug 2008 Posts: 3854
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Posted: Wed May 06, 2009 6:12 pm Post subject: Puzzle NR_010 |
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Code: | +-----------------------+
| 4 . . | . 5 2 | . . 1 |
| . 5 7 | . 8 . | 3 2 . |
| . 1 . | . . . | . . . |
|-------+-------+-------|
| . . . | . . . | . . . |
| 2 8 . | . . 1 | . . . |
| 7 . . | . 2 5 | 8 6 . |
|-------+-------+-------|
| . 2 . | . . 9 | 6 . 8 |
| . 4 . | . . 8 | . 1 9 |
| 8 . . | . . . | 2 3 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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gindaani
Joined: 06 Mar 2009 Posts: 79
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Posted: Wed May 06, 2009 10:24 pm Post subject: |
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I found a 3 stepper:
Quote: | 3 skyscraper
3 x-wing
Advanced coloring or 97-73-35-57-75-59
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An alternate solution that some will prefer:
Quote: | 3 skyscraper
3 x-wing
793 xy-wing
5 skyscraper
BUG+1
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storm_norm
Joined: 18 Oct 2007 Posts: 1741
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Posted: Wed May 06, 2009 11:05 pm Post subject: |
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Code: | .---------------------.---------------------.---------------------.
| 4 36 8 | 36 5 2 |A79 I7-9 1 |
| 9 5 7 | 1 8 46 | 3 2 46 |
| 36 1 2 |E3679 F34679 37 | 45 8 456 |
:---------------------+---------------------+---------------------:
| 356 36 3456 | 8 G3679 37 | 1 H459 2 |
| 2 8 3456 | 369 369 1 | 459 459 7 |
| 7 9 1 | 4 2 5 | 8 6 3 |
:---------------------+---------------------+---------------------:
| 1 2 35 |D357 347 9 | 6 457 8 |
| 356 4 356 | 2 C37 8 |B57 1 9 |
| 8 7 9 | 56 1 46 | 2 3 45 |
'---------------------'---------------------'---------------------' |
a one step chain
(9=7)A - (7)B = (7)C - (7)D = (7-9)E = (9)F - (9)G = (9)H; I is not 9 |
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tlanglet
Joined: 17 Oct 2007 Posts: 2468 Location: Northern California Foothills
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Posted: Thu May 07, 2009 8:25 pm Post subject: |
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My three moves were:
a finned swordfish on 3 in r578c345 with fin r8c1. The fin does not make a direct deletion, but treating it like a "Kraken fin" deletes the 3 in r1c4,
w-wing 37 with pincers in r3c6 and r8c5 with strong link in row4; additional deletion by transporting a pincer,
xy-wing 357 with pivot 37 inr7c4 and pseudo-cell 35 in row5.
A fun puzzle
Ted |
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daj95376
Joined: 23 Aug 2008 Posts: 3854
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Posted: Thu May 07, 2009 9:32 pm Post subject: |
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I'm just rambling here.
Before I wrote my solver, I would encounter a PM like this and ponder what to do with it. One of my favorite ways to proceed was to look for what I called a three-way branch.
If you look at the 3s in this PM, you'll notice that [r1c2]=3 must be true, or else [r1c4],[r3c1],[r4c2]=3 must be true. A quick examination of the latter possibility leads to <3> being eliminated from [c6]. So, I would set [r1c2]=3 and proceed merrily along.
Code: | *--------------------------------------------------------------------*
| 4 *36 8 |@36 5 2 | 79 79 1 |
| 9 5 7 | 1 8 46 | 3 2 46 |
|@36 1 2 | 3679 34679 ~37 | 45 8 456 |
|----------------------+----------------------+----------------------|
| 356 @36 3456 | 8 3679 ~37 | 1 459 2 |
| 2 8 3456 | 369 369 1 | 459 459 7 |
| 7 9 1 | 4 2 5 | 8 6 3 |
|----------------------+----------------------+----------------------|
| 1 2 35 | 357 347 9 | 6 457 8 |
| 356 4 356 | 2 37 8 | 57 1 9 |
| 8 7 9 | 56 1 46 | 2 3 45 |
*--------------------------------------------------------------------*
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Boy is it nice to reminisce occasionally! |
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gindaani
Joined: 06 Mar 2009 Posts: 79
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Posted: Thu May 07, 2009 10:05 pm Post subject: |
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A skyscraper on <3> at r14c2 and r34c6 eliminates <3> from r1c4 and r3c1.
It seems to me that the skyscraper is easier to spot than the three-way branch. |
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Marty R.
Joined: 12 Feb 2006 Posts: 5770 Location: Rochester, NY, USA
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Posted: Sun May 10, 2009 1:19 am Post subject: |
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For me it was an ER sandwich, 3 and 5, with a W-Wing on 37 plus pincer transport as the filling. |
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