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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue May 25, 2010 4:32 pm Post subject: Puzzle 10/05/25: (B) VH+ |
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XYZ-Wing alert
| Code: | +-----------------------+
| 3 6 . | . . 7 | . 8 1 |
| 1 . . | . . 5 | . . . |
| . . 5 | 8 . . | 6 4 . |
|-------+-------+-------|
| . . 1 | 9 . . | . 6 . |
| . . . | . . . | . . . |
| 6 9 . | . . . | 7 . . |
|-------+-------+-------|
| . . 2 | . . 8 | . 1 . |
| 5 . 8 | 1 . . | 9 . . |
| 9 . . | . . . | . . 8 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed May 26, 2010 9:33 pm Post subject: |
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This has been left alone for a bit so I'll get in with a 3 step:
| Quote: | 1. Skyscraper on 5s removes 5 at r6c4
2. XY Chain removing 4 at r5c6 pincers at r6c4 and r9c6
3 Big Baphomet showing contradiction on 4s:
(4)r6c9=r4c9-r4c1=r5c2-r8c2=r8c5-r9c6=r5c6-r6c4=(4)r6c9 so r6c9 = 4 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed May 26, 2010 10:27 pm Post subject: |
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Maybe I screwed up, but there was a DP 24-27-47 which could only be killed with r4c2=5 and that's all I needed.
Someone will tell me if I need to do it again. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed May 26, 2010 10:29 pm Post subject: |
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Just playing around to avoid the xyz-wing.
ANP(24=5)r15c5 - r9c5 = (5-2)r9c8 = (2)r8c9; r8c5<>2
kite 5 with hinge in box9; r6c4<>5
ADP34 in r789c257: (7)r7c2 = (25)r89c5 to prevent deadly pattern
(7)r7c2 - (7=4)r7c1 - r4c1 = (4)r5c2
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SS(25)r9c58 - (2=4)r9c6
Thus, these two pincers on (4) gives r5c6<>4
Ted |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed May 26, 2010 10:34 pm Post subject: |
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| Marty R. wrote: | Maybe I screwed up, but there was a DP 24-27-47 which could only be killed with r4c2=5 and that's all I needed.
Someone will tell me if I need to do it again. |
Marty, I played around that ADP, but was unable to find a solution. I would be very interested in your technique. To prevent the DP, I had the constraints: r4c2=5 or r7c2=3.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed May 26, 2010 11:06 pm Post subject: |
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| tlanglet wrote: | | Marty R. wrote: | Maybe I screwed up, but there was a DP 24-27-47 which could only be killed with r4c2=5 and that's all I needed.
Someone will tell me if I need to do it again. |
Marty, I played around that ADP, but was unable to find a solution. I would be very interested in your technique. To prevent the DP, I had the constraints: r4c2=5 or r7c2=3.
Ted |
I had that DP on my first go-round and it created a pincer situation (the 3 proved a 5 somewhere) which eliminated enough to finish with a 2nd DP, which might've been 35-36-56. Alas, I ended up with an invalidity and did it again, with the solution posted above. Looks like I messed up twice. |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Fri May 28, 2010 3:43 pm Post subject: |
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| Marty - you've reminded me that I really need to go away and study 3-way DPs - I just generally don't tend to look for them. |
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