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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue May 25, 2010 4:36 pm Post subject: Puzzle 10/05/25: (C) Advanced |
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| Code: | +-----------------------+
| . . 5 | . . 8 | . . . |
| . 6 . | . 7 . | . 2 5 |
| 7 . 2 | . . . | 9 8 . |
|-------+-------+-------|
| . . . | 5 . . | . 4 2 |
| . 5 . | . 8 . | . . . |
| 2 . . | . . 7 | . 9 . |
|-------+-------+-------|
| . . 6 | . . . | . . 9 |
| . 7 1 | 8 . 5 | . 6 . |
| . 9 . | 6 . . | 8 . 4 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| hint wrote: | 2x concurrent steps join to crack puzzle.
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue May 25, 2010 6:13 pm Post subject: |
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This seemed to solve it without any concurrent steps? Looked like lots of UR moves on the way though..
| Quote: | | w-wing(34); (4=3)r3c4-r2c6=r7c6-(3=4)r7c5; r1c5<>4 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed May 26, 2010 12:10 pm Post subject: |
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Maybe I messed up basics, but
| Quote: | My first pass was three steps:
Type 1 UR 67 that forced r5c7=3,
AIC: (1=4)r1c2 - r3c2 = r3c4 - r5c4 = r5c6 - (4=3)r7c6 - (3=1)r2c6; r1c45<>1, r2c1<>1,
xy-wing 13-4 with vertex 13 in r2c6 and pseudocell 14 in r59c6; r5c4<>4.
Then, on my second pass I saw a w-wing 34 in r3c4 & r7c6 and SL (4) in r5c46 for a one stepper. |
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed May 26, 2010 2:52 pm Post subject: |
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| Code: | r36 X-Wing <> 3 r2c4 extraneous
<36> UR r45c17 => r4c1=1 and/or r5c7= 7
<67> UR r15c79 => r5c7<>67
r4c1=1 q.e.d.
*-----------------------------------------------------------*
| 19 14 5 | 1249 124 8 | 67 3 67 |
| 139 6 8 | 139 7 13 | 4 2 5 |
| 7 34 2 | 34 5 6 | 9 8 1 |
|-------------------+-------------------+-------------------|
| 136 8 7 | 5 13 9 | 36 4 2 |
| 36 5 9 | 24 8 24 | 367 1 67 |
| 2 13 4 | 13 6 7 | 5 9 8 |
|-------------------+-------------------+-------------------|
| 8 2 6 | 7 34 34 | 1 5 9 |
| 4 7 1 | 8 9 5 | 2 6 3 |
| 5 9 3 | 6 12 12 | 8 7 4 |
*-----------------------------------------------------------*
as two steps separated by basics:
r15c79 <67> UR Type 1.2223 r5c7<>67
r45c17 <36> UR Type 1.1112 *** r4c1<>3
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu May 27, 2010 4:23 am Post subject: |
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I used multiple steps.
Type 1 UR (67)
X-Wing (3)
Finned X-Wing (1)
XY-Wing (241), flightless, with transport of each pincer |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Thu May 27, 2010 9:55 am Post subject: |
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Danny, that's a neat duel-UR move! I'd have just made the type 1 elimination and moved on and missed it.
As always enjoying your puzzles.
Peter |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu May 27, 2010 3:18 pm Post subject: |
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| Peter: I'm glad you enjoyed the UR. I've encountered a few recently in my puzzles. There's going to be another interesting one in today's advanced puzzle. It has an interesting twist that cracks the puzzle. |
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