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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Sep 30, 2010 5:06 am Post subject: Puzzle 10/09/30: C XY |
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| Code: | +-----------------------+
| 6 . . | 8 3 . | 2 . . |
| . 2 . | . . . | 8 . 4 |
| . . 8 | 9 . . | . . 7 |
|-------+-------+-------|
| 5 . 6 | 4 . 9 | 1 . . |
| 2 . . | . 7 . | 6 . . |
| . . . | 5 . 6 | . . 2 |
|-------+-------+-------|
| 8 9 . | 2 5 . | . . . |
| . . . | . . . | . 2 5 |
| . 5 2 | . . 7 | . 4 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
This is a test.
| Solution wrote: | M-Wing 6A (7=4)r1c2 - r3c1 = (4-7)r8c1 = (7)r78c3 => r1c3<>7
M-Wing 7A (7=4)r1c2 - r3c1 = (4-7)r8c1 = (7)r6c1 => r46c2<>7
-or-
L-Wing (7)r1c2 = r46c2 - r6c1 = (7-4)r8c1 = (4)r3c1 => r1c2<>4
L-Wing (7)r1c2 = r1c3 - r78c3 = (7-4)r8c1 = (4)r3c1 => r1c2<>4
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Thu Sep 30, 2010 8:37 pm Post subject: |
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| Quote: | | 4-SIS AIC : 8C5 8R5 4R5 4R7 : (8)r8c5=(4)r7c6 : => r8c5<>4 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 02, 2010 4:37 am Post subject: |
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| I used a chain which doesn't technically meet the definition of an XY-Chain because there was a non-bivalue cell. R1c6, r3c12<>4. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Oct 02, 2010 1:35 pm Post subject: |
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I spent some time looking first for standard patterns and then for AICs, but the steps I found were not particularly useful; I was headed for a BBDBer. However, my first stab at a ANP did the trick.
ANP(4=16)r23c5-(1=8)r6c5-(8=7)r6c8-r4c8=r4c2-(7=4)r1c2; r1c6, r3c12<>4.
I just looked at Marty's post and realized our deletions are the same; wonder if the chains are also identical?
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Oct 02, 2010 3:55 pm Post subject: |
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A nice ANT also does the job...
| Code: | | ANT(139):[(7)r6c1=(139)r269c1] - (13=4)r3c1 - (4=7)r1c2 ; r46c2<>7 |
(Equivalent to one of the m-wings Danny lists) |
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