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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sat Oct 24, 2009 2:09 am Post subject: Free Press October 23, 2009 |
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I found an unusual one-step solution: | Code: | Puzzle: FP102309
+-------+-------+-------+
| . . . | 1 . . | . . . |
| . . . | 6 . 9 | 5 . . |
| 3 . 2 | . . . | . . 4 |
+-------+-------+-------+
| . . 1 | . 8 . | 7 . . |
| 6 . . | . . . | . . 2 |
| . . 8 | . 3 . | 9 . . |
+-------+-------+-------+
| 5 . . | . . . | 6 . 1 |
| . . 6 | 3 . . | 2 . . |
| 8 . . | . . 7 | 4 . . |
+-------+-------+-------+ |
(It's the kind of thing re'born would do.)
Keith |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 24, 2009 4:21 am Post subject: |
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| Quote: | | (It's the kind of thing re'born would do.) |
But not the type of thing Marty would do. My one-stepper would not be described by very many as unusual.
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Sat Oct 24, 2009 6:56 am Post subject: |
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I like yours better Marty but here is another: | Code: | *--------------------------------------------------------------------*
| 79-4 5679-4 579-4 | 1 *24 3 | 8 a269 79 |
| 1 8 *47 | 6 2-4 9 | 5 b23 37 |
| 3 69 2 | 578 57 58 | 1 69 4 |
|----------------------+----------------------+----------------------|
| 29 3 1 | 59 8 26 | 7 4 56 |
| 6 4579 4579 | 4579 157 145 | 3 8 2 |
| 247 457 8 | 457 3 26 | 9 1 56 |
|----------------------+----------------------+----------------------|
| 5 2 d37 | 48 9 48 | 6 c37 1 |
| 479 479 6 | 3 15 15 | 2 79 8 |
| 8 1 39 | 2 6 7 | 4 5 39 |
*--------------------------------------------------------------------*
(4=2)r1c5-(2)r1c8=(2-3)r2c8=(3-7)r7c8=(7)r7c3-(7=4)r2c3
=> r1c123,r2c5<>4;
singles |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Sun Oct 25, 2009 1:49 am Post subject: |
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Here is mine: | Code: | *--------------------------------------------------------------------*
| 794 56794 5794 | 1 24 3 | 8 269 c79 |
| 1 8 d47 | 6 24 9 | 5 23 37 |
| 3 69 2 | 578 57 58 | 1 69 4 |
|----------------------+----------------------+----------------------|
| 29 3 1 | 59 8 26 | 7 4 56 |
| 6 4579 4579 | 4579 157 145 | 3 8 2 |
| 247 457 8 | 457 3 26 | 9 1 56 |
|----------------------+----------------------+----------------------|
| 5 2 3-7 | 48 9 48 | 6 a37 1 |
| 479 479 6 | 3 15 15 | 2 79 8 |
| 8 1 39 | 2 6 7 | 4 5 b39 |
*--------------------------------------------------------------------* |
abc is a useless XY-wing with pincers 7. However, grouped coloring in R1 and B1 extends c to d, eliminating 7 in R7C3.
Keith |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Sun Oct 25, 2009 2:30 am Post subject: Free Press |
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xy-chains may be a brute force technique, but they often do the job.
R2C8 - R9C9 are pincers (3) which solve the puzzle.
Earl
of the chain gang |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sun Oct 25, 2009 3:10 am Post subject: |
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This is what I thought Keith was expecting from re'born.
| Code: | There is a useless Skyscraper (*) in <7>
There is a strong link (#) in <3>
(3)r2c8 = (3-7)r7c8 = r7c3 - r3c3 = (7)r2c9 => r2c9<>3
*--------------------------------------------------------------------*
| 794 56794 5794 | 1 24 3 | 8 269 79 |
| 1 8 47* | 6 24 9 | 5 #23 37* |
| 3 69 2 | 578 57 58 | 1 69 4 |
|----------------------+----------------------+----------------------|
| 29 3 1 | 59 8 26 | 7 4 56 |
| 6 4579 4579 | 4579 157 145 | 3 8 2 |
| 247 457 8 | 457 3 26 | 9 1 56 |
|----------------------+----------------------+----------------------|
| 5 2 37* | 48 9 48 | 6 #37* 1 |
| 479 479 6 | 3 15 15 | 2 79 8 |
| 8 1 39 | 2 6 7 | 4 5 39 |
*--------------------------------------------------------------------*
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There's also a strong link in <3> for [c9] => r7c8<>3. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Oct 25, 2009 1:59 pm Post subject: |
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I just got around to working on this puzzle and spotted an xy-wing 24-7 with vertex 24 in r2c5, pincer 47 in r2c3 and pincer 27 is a pseudocell in col8 to delete 7 in r7c3.
This is very similar to the solution by Keith; it does make the same elimination.
Ted |
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