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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Apr 17, 2010 5:59 pm Post subject: Puzzle 10/04/17 (A) |
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| Code: | +-----------------------+
| . . . | . . . | . . 6 |
| . . . | . . . | 2 1 . |
| . . 9 | 1 . 2 | 4 8 7 |
|-------+-------+-------|
| . . 8 | 4 . . | 6 . . |
| . . . | . . 8 | . . . |
| . . 6 | . 2 5 | . 4 8 |
|-------+-------+-------|
| . 2 4 | 8 . . | 1 . . |
| . 5 1 | . . 6 | . 7 4 |
| 8 . 7 | . . 4 | . 6 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Apr 17, 2010 9:12 pm Post subject: |
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Enjoyable puzzle.
| Quote: | UR 48 in r12c25. Looking at the outside column implications we find:
Digit 4: r5c2= 4
Digit 8: None
Thus r5c2 must equal 4 to prevent the deadly pattern.
x-wing 3 r38c15,
ALS[(3)r12c6 = (7)r1c6]r12c6 - r7c6 = r7c5 - (7=9)r4c5 - (9=3)r8c5; r7c6<>3.
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Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Apr 17, 2010 9:57 pm Post subject: |
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Lots of options - but two simple steps does it...
| Quote: | x-wing(3)
xy-wing(359 vertex r8c5; r1c4<>5 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Apr 18, 2010 12:32 am Post subject: |
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| My X-Wing and XY-Wing were the same as Peter's. However, I first played the 48 UR because it was there, but apparently contributed nothing. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Sun Apr 18, 2010 12:58 am Post subject: |
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Marty and Peter, how did you zap the 3 in R9C4 to allow you to play the XY-wing 359 with the pivot on 39 in R8C5?  |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Apr 18, 2010 1:30 am Post subject: |
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| Wendy W wrote: | | Marty and Peter, how did you zap the 3 in R9C4 to allow you to play the XY-wing 359 with the pivot on 39 in R8C5? |
Wendy,
Here is my (hasty) grid from trying it on Draw/Play:
| Code: |
+----------------+---------------+---------------+
| 14 148 2 | 3579 48 379 | 359 359 6 |
| 47 478 35 | 6 48 39 | 2 1 359 |
| 35 6 9 | 1 35 2 | 4 8 7 |
+----------------+---------------+---------------+
| 23579 379 8 | 4 379 1 | 6 2359 359 |
| 234579 3479 35 | 379 6 8 | 3579 2359 1 |
| 1379 1379 6 | 379 2 5 | 379 4 8 |
+----------------+---------------+---------------+
| 6 2 4 | 8 3579 379 | 1 359 359 |
| 39 5 1 | 2 39 6 | 8 7 4 |
| 8 39 7 | 359 1 4 | 359 6 2 |
+----------------+---------------+---------------+
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Play this puzzle online at the Daily Sudoku site
The X-Wing on 3 in rows 38 takes out the 3 from r4c5. Now, locked candidates on 3 in box 5 force out the 3 from r9c4. Locked candidates are also known as box-line interactions. |
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Wendy W
Joined: 04 Feb 2008
Posts: 144
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| Posted: Sun Apr 18, 2010 11:04 am Post subject: |
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| Arghh!! Yes, of course. Thanks, Marty. This can be a humbling game. |
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