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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jun 12, 2010 8:46 pm Post subject: Puzzle 10/06/12: (A) VH (corrected) |
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| Code: | +-----------------------+
| 9 . . | 1 7 . | . . . |
| . 7 . | 6 9 5 | . . . |
| . . 6 | 4 . 3 | . . . |
|-------+-------+-------|
| 4 3 8 | 5 . . | 7 . . |
| 6 1 . | . 4 7 | . . 9 |
| . 9 7 | . 6 . | . . 3 |
|-------+-------+-------|
| . . . | 9 . . | 4 . . |
| . . . | . . . | . . 7 |
| . . . | . 3 1 | . 8 . |
+-----------------------+
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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 Jun 13, 2010 1:56 pm Post subject: |
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Sticking to VH steps..
| Quote: | x-wing(3); r2c38<>3, r8c3<>3
xy-wing(236) r1c8; r2c8<>2
BUG+1; r3c2=8 |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sun Jun 13, 2010 4:11 pm Post subject: |
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One step solution
| Quote: | | Cell r8c1 is at the same time at the origin of 3 spokes and a member of an XWing on 3 => (8)r7c2=NQ(1258)r7c2589 :=> r7c3<>5 |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Sun Jun 13, 2010 7:58 pm Post subject: |
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| JC Van Hay wrote: | One step solution
| Quote: | | Cell r8c1 is at the same time at the origin of 3 spokes and a member of an XWing on 3 => (8)r7c2=NQ(1258)r7c2589 :=> r7c3<>5 |
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Hi JC, great to see you here!
Would you please elaborate? Is your "spoke" akin to Steve K's hub/spoke/rim logic? I'm lost... |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jun 14, 2010 1:10 am Post subject: |
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| I used Peter's three steps of X-Wing (3) and XY-Wing (362) and BUG+1. |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Mon Jun 14, 2010 6:54 am Post subject: |
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Hi Luke451, thanks for the welcome.
Me too and I am confused.  . While bicycling too fast through the puzzle, I blindly fell into a tautological loophole that broke my rim. Mea culpa.
Here is a more conventional alternative 3-steps proof :
ER on 8 : 2-SIS (8)b2r7 : => -(8)r1c2
XWing on 3 : 2-SIS (3)c17 : => -(3)r2c8
WWing : 3-SIS (2)r4, (12)r2c8 & (12)r7c9 : => -(1)r7c8 JC |
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