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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Oct 30, 2010 5:35 pm Post subject: Puzzle 10/10/31: B3 XY |
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I'm hanging up my hat on posting puzzles. Today's puzzles are the last.
| Code: | +-----------------------+
| 4 . . | . . . | . . . |
| . 8 9 | . 5 . | . . . |
| . 6 1 | . . 7 | . 5 . |
|-------+-------+-------|
| . . . | 6 8 . | 1 . . |
| . 1 . | 5 7 4 | 2 . 3 |
| . . 6 | . 2 . | . 7 8 |
|-------+-------+-------|
| . . . | 8 4 . | 9 . . |
| . . 4 | . . 9 | . 8 . |
| . . . | . 6 5 | . . 4 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Oct 31, 2010 3:22 pm Post subject: |
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Two moves - no basics in between, if there was a simpler path I missed it!
| Quote: | skyscraper(2) r3, r8 ; r1c2<>2
ANP(27=5)r4c13 - (5=9)r4c9 - (9=2)r3c9 - r8c9=r8c2 ; r4c2<>2 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Nov 03, 2010 3:15 pm Post subject: |
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Not much simpler.
| Code: | Sashimi X-Wing r38\c29 (Skyscraper) <> 2 r1c2
XY-Chain (5=9)r4c9 - (9=2)r3c9 - (2=3)r3c1 - (3=5)r6c1 => r4c1,r6c7<>5
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Thu Nov 04, 2010 6:17 pm Post subject: |
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| I don't know what it should be called. It started out as an XY-Chain and established pincers that eliminated nothing. Then the pincer was extended, I would guess by AIC principles, to force r9c3<>2. That established a 37 pair which was all that was needed. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Nov 10, 2010 3:20 pm Post subject: |
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A fun puzzle............
Flightless xy-wing 45-9: (9=4)r4c8-(4=5)r6c7-(5=3)r6c1-(3=2)r3c1-(2=9)r3c9; r1c8,r4c9<>9
This brings us to the following code:
| Code: | *-----------------------------------------------------------*
| 4 257 257 | 123 139 8 | 6 123 1279 |
| 237 8 9 | 123 5 6 | 37 4 127 |
| 23 6 1 | 4 39 7 | 8 5 29 |
|-------------------+-------------------+-------------------|
| 27 4 27 | 6 8 3 | 1 9 5 |
| 9 1 8 | 5 7 4 | 2 6 3 |
| 5 3 6 | 9 2 1 | 4 7 8 |
|-------------------+-------------------+-------------------|
| 16 57 357 | 8 4 2 | 9 13 167 |
| 16 27 4 | 137 13 9 | 5 8 1267 |
| 8 9 237 | 17 6 5 | 37 123 4 |
*-----------------------------------------------------------* |
A hidden UR(57)r17c23 deletes 7 in r1c3, which is not very useful. However, If we treat the pattern as a general AUR and look at the internal SIS, r1c23=2 & r7c3=3, we have a more productive result.
(3=2)r3c1-AUR(57)[(2)r1c23=(3)r7c3]-(3=1)r7c8-r7c1=r8c1-(1=3)r8c5; r3c5<>3.
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Nov 10, 2010 9:27 pm Post subject: |
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| tlanglet wrote: | | (3=2)r3c1-AUR(57)[(2)r1c23=(3)r7c3]-(3=1)r7c8-r7c1=r8c1-(1=3)r8c5; r3c5<>3. |
Nice 
I like AURs making strong-links (and broken wings too of course  ) |
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