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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Apr 30, 2010 8:27 am Post subject: Puzzle 10/04/30 (I) Advanced |
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| Code: | +-----------------------+
| 5 . . | . 7 . | . . 9 |
| . 9 . | . . . | 7 . 6 |
| . . . | 5 . 9 | 8 . . |
|-------+-------+-------|
| . . 5 | . . . | 2 4 . |
| 7 . . | . 4 . | . . . |
| . . 4 | . . . | . . 7 |
|-------+-------+-------|
| . 1 6 | 4 . . | . . 2 |
| . . . | 3 . . | . 6 . |
| 3 7 . | . . 6 | 4 . . |
+-----------------------+
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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: Fri Apr 30, 2010 10:52 pm Post subject: |
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I did not see any quick bivalue steps so I looked at some single digit patterns and hit the jackpot; two steps.
| Quote: | ER 8 box7 strong link in r1c36; r7c6<>8
(2)r2c1-(2=8)r2c4-(8=9)r6c4-(9=1)r6c8-(1=2)r6c1; r2c1<>2
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Ted |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Sat May 01, 2010 6:26 am Post subject: |
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A sort of converse to Ted or, for the photographers, a negative
| Quote: | 1.Colouring on 8: (5=8)r7c6-r7c1=r2c1-r1c3=r1c6-(8)r7c6 so r7c6<>8 (same result but different technique to Ted's ER)
2.xy chain removes 1 from r6c1: pincers at r2c1 and r6c8
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat May 01, 2010 8:53 am Post subject: |
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I don't know but my first step on 8 was just a standard one and ended in the same place...
| Quote: | kite(8) box 1; r7c6<>8
ALS-XZ ALS(1289)r6c148, ALS(28)r2c4, X=8, Z=2; r2c1<>2 |
I did the same xy-chain as mogulmeister first time through but went back to see if I could find an alternative (still practising these things, slowly learning where it's fruitful to look!) |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat May 01, 2010 11:44 am Post subject: |
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| peterj wrote: | I don't know but my first step on 8 was just a standard one and ended in the same place...
| Quote: | kite( box 1; r7c6<>8
ALS-XZ ALS(1289)r6c148, ALS(28)r2c4, X=8, Z=2; r2c1<>2 |
I did the same xy-chain as mogulmeister first time through but went back to see if I could find an alternative (still practising these things, slowly learning where it's fruitful to look!) |
Peter, Great Find on the ALS-XZ  It was just waiting to be picked.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun May 09, 2010 3:22 pm Post subject: |
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It's a good thing there are ERs, otherwise I wouldn't have been able to get
going.
ERs (8,9)
M-Wing (38), flightless with pincer transport
(XY-Wing (283) |
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