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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Thu Sep 01, 2011 6:12 pm Post subject: Free Press September 1, 2011 (Thursday) |
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Requires (one?) advanced move.
| Code: | Puzzle: FP090111
+-------+-------+-------+
| . 2 6 | . . . | 8 . . |
| 4 . . | . 3 . | . . 2 |
| . 7 . | . 6 . | . . . |
+-------+-------+-------+
| . . . | . . . | 6 5 . |
| . 6 . | 7 . 2 | . 9 . |
| . 1 8 | . . 5 | . . . |
+-------+-------+-------+
| . . . | . 8 . | . 2 . |
| 7 . . | 3 5 . | . . 6 |
| . . 5 | . . . | 9 8 . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Sep 01, 2011 9:54 pm Post subject: |
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| Code: |
+-----------+-----------+--------------+
| 39 2 6 | 5 7 14 | 8 134 149 |
| 4 5 1 | 9 3 8 | 7 6 2 |
| 8 7 39 | 2 6 14 | 145 134 1459 |
+-----------+-----------+--------------+
| 2 49 7 | 8 149 3 | 6 5 14 |
| 5 6 34 | 7 14 2 | 134 9 8 |
| 39 1 8 | 6 49 5 | 2 7 34 |
+-----------+-----------+--------------+
| 16 349 49 | 14 8 67 | 35 2 357 |
| 7 8 2 | 3 5 9 | 14 14 6 |
| 16 34 5 | 14 2 67 | 9 8 37 |
+-----------+-----------+--------------+
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Play this puzzle online at the Daily Sudoku site
I think in band 3 there is a potential DP 16-34-14-67-37. A 9 in r7c2 or 5 in r7c9 kills it. The 5 proves 9 in r6c1. With pincers, r4c2<>9. |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Fri Sep 02, 2011 1:11 am Post subject: |
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| Marty R. wrote: | | I think in band 3 there is a potential DP 16-34-14-67-37. A 9 in r7c2 or 5 in r7c9 kills it. The 5 proves 9 in r6c1. With pincers, r4c2<>9. |
Marty, that is a very nice BUG-Lite+2 find. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Sep 02, 2011 1:38 am Post subject: |
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Thank you. Even a blind pig finds an acorn once in a while.  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Fri Sep 02, 2011 8:21 pm Post subject: |
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After basics: | Code: | +----------------+----------------+----------------+
| 39 2 6 | 5 7 14 | 8 134 149 |
| 4 5 1 | 9 3 8 | 7 6 2 |
| 8 7 39 | 2 6 14 | 145 134 1459 |
+----------------+----------------+----------------+
| 2 49 7 | 8 149 3 | 6 5 14 |
| 5 6 34 | 7 14 2 | 134 9 8 |
| 39 1 8 | 6 49 5 | 2 7 34 |
+----------------+----------------+----------------+
| 16 349 49 | 14 8 67 | 35 2 357 |
| 7 8 2 | 3 5 9 | 14 14 6 |
| 16 34 5 | 14 2 67 | 9 8 37 |
+----------------+----------------+----------------+ |
You can admire Marty's pattern here!
Or, a pair of XY-wings solves it.
Keith |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Sep 03, 2011 1:25 am Post subject: |
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My initial move was turning a seemingly useless Type 2 UR into a useful step which then required a xy-wing (49-3) to complete the puzzle.
(4)r4c2=(4)r5c3-(4=9=3)r73c3-AUR(14)r13c68[(3)r3c8=(3)r1c8]-r1c1=r6c1-(3=4)r6c9; r4c9<>4
However, I then realized the xy-wing was an one stepper almost xy-wing solution.
axy-wing(49-3)r1c19+r6c9=(1)r1c9-(1=4=3)r46c9; r6c1<>3
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Sep 03, 2011 1:31 am Post subject: |
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Marty, That move belongs in the collection of very special patterns! Great find......
Ted |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Sat Sep 03, 2011 5:44 pm Post subject: |
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| tlanglet wrote: | | Marty, That move belongs in the collection of very special patterns! Great find...... |
Agreed! I've already added it to my notebook. Don't think I've ever seen that particular setup.  |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Sun Sep 04, 2011 5:33 pm Post subject: |
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| Luke451 wrote: | | tlanglet wrote: | | Marty, That move belongs in the collection of very special patterns! Great find...... |
Agreed! I've already added it to my notebook. Don't think I've ever seen that particular setup. |
The "parent" MUG+0, for lack of a better term, looks like this:
| Code: |
abcde . abcde | abcde . abcde | . abcde .
. . . | . . . | . . .
abcde . abcde | abcde . abcde | . abcde .
----------------+----------------+------------
. . . | . . . | . . . |
One or more of the candidates may be missing in one or more of the ten cells and, in a puzzle with a unique solution, at least one of the ten cells must have an extra candidate. |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sat Sep 24, 2011 2:19 am Post subject: |
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SS says:
2 x XY-Wing
2 x Intersection Removal
3 x Simple Naked Sets
23 x Pinned Squares
I thought the two XY-wings might be supplanted by a single move. Leave it to Marty to find an iconic solution!
Keith |
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