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Puzzle 10/06/12: (A) VH (corrected)

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Jun 12, 2010 8:46 pm Post subject: Puzzle 10/06/12: (A) VH (corrected)

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 . |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Sun Jun 13, 2010 1:56 pm Post subject:

Sticking to VH steps..

Quote:

x-wing(3); r2c38<>3, r8c3<>3
xy-wing(236) r1c8; r2c8<>2
BUG+1; r3c2=8

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Sun Jun 13, 2010 4:11 pm Post subject:

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

Luke451

Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

Posted: Sun Jun 13, 2010 7:58 pm Post subject:

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

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...

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Jun 14, 2010 1:10 am Post subject:

I used Peter's three steps of X-Wing (3) and XY-Wing (362) and BUG+1.

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Mon Jun 14, 2010 6:54 am Post subject:

Hi Luke451, thanks for the welcome.

Luke wrote:

I'm lost...

Me too and I am confused. Embarassed

. 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 :

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