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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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 Posted: Sun Jul 19, 2009 10:43 pm Post subject: Free Press 26 June, 2009 |
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| Code: | Puzzle: FP062609
+-------+-------+-------+
| . . . | . 6 . | . 1 . |
| 6 . . | 3 . . | . 4 . |
| 5 . 8 | . 4 . | . . 6 |
+-------+-------+-------+
| . . . | . . . | 7 8 . |
| 7 9 . | 5 . 2 | . 6 4 |
| . 8 1 | . . . | . . . |
+-------+-------+-------+
| 8 . . | . 1 . | 6 . 2 |
| . 4 . | . . 7 | . . 5 |
| . 6 . | . 5 . | . . . |
+-------+-------+-------+ |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jul 20, 2009 5:06 am Post subject: |
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| UR, XY-Wing, BUG+1. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Mon Jul 20, 2009 2:39 pm Post subject: |
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I believe that I had the same solution as Marty.
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Mon Jul 20, 2009 6:29 pm Post subject: |
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| Code: | .------------------.------------------.------------------.
| 39 237 4 | 28 6 589 | 359 1 78 |
| 6 127 79 | 3 279 1589 | 59 4 78 |
| 5 137 8 | 179 4 19 | 39 2 6 |
:------------------+------------------+------------------:
| 2 5 6 | 14 39 14 | 7 8 39 |
| 7 9 3 | 5 8 2 | 1 6 4 |
| 4 8 1 | 79 379 6 | 2 5 39 |
:------------------+------------------+------------------:
| 8 37 5 | 49 1 349 | 6 79 2 |
| 1 4 29 | 6 29 7 | 8 3 5 |
| 39 6 279 | 28 5 389 | 4 79 1 |
'------------------'------------------'------------------' |
extended w-wing {7,9}
(7=9)rr2c3 - (9)r8c3 = (9)r9c13 - (9=7)r9c8 - (7)r7c8 = (7)r7c2; r123c2 <> 7
xy-wing {1,2,9} removes 1 from r3c2 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 21, 2009 12:48 am Post subject: |
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| storm_norm wrote: | | Code: | .------------------.------------------.------------------.
| 39 237 4 | 28 6 589 | 359 1 78 |
| 6 127 79 | 3 279 1589 | 59 4 78 |
| 5 137 8 | 179 4 19 | 39 2 6 |
:------------------+------------------+------------------:
| 2 5 6 | 14 39 14 | 7 8 39 |
| 7 9 3 | 5 8 2 | 1 6 4 |
| 4 8 1 | 79 379 6 | 2 5 39 |
:------------------+------------------+------------------:
| 8 37 5 | 49 1 349 | 6 79 2 |
| 1 4 29 | 6 29 7 | 8 3 5 |
| 39 6 279 | 28 5 389 | 4 79 1 |
'------------------'------------------'------------------' |
extended w-wing {7,9}
(7=9)rr2c3 - (9)r8c3 = (9)r9c13 - (9=7)r9c8 - (7)r7c8 = (7)r7c2; r123c2 <> 7
xy-wing {1,2,9} removes 1 from r3c2 |
Norm, your chains are always impressive  I would truly enjoy knowing how you go about finding them.
Ted |
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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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| Posted: Tue Jul 21, 2009 8:04 pm Post subject: Free Press |
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I think just two xy-wings will do it: 379 then 129.
Earl |
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