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Puzzle 10/04/11 (A)

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun Apr 11, 2010 2:02 pm Post subject: Puzzle 10/04/11 (A)

Code:

+-----------------------+
| 6 . 2 | . . 9 | . . 7 |
| . 7 4 | . . . | . 9 5 |
| 9 3 1 | . . 4 | . 6 . |
|-------+-------+-------|
| . . . | 2 . 3 | . . . |
| . . . | . 9 . | . . 3 |
| 5 . 3 | 8 . . | . . . |
|-------+-------+-------|
| . . . | . . . | . . 8 |
| . 2 9 | . . . | . 5 . |
| 3 6 . | . 5 . | 4 . . |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Mon Apr 12, 2010 1:00 am Post subject:

Quote:

An XY-Wing (192) did it. I first noticed a Type 1 UR (13) which I assume would also have been a one-stepper.

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Mon Apr 12, 2010 1:57 pm Post subject:

Quote:

I started with the type 1 UR13 and then the xy-wing 1-29. So Marty, I showed that the UR13 was not a one stepper, and you showed that the UR13 was not needed.

After making my initial post, I decided to look for an alternate approach and found a one step ALS.
ALS A 167 in r8c79
ALS B 127 in r9c68
Exclusive: 7
Common: 1
r9c9<>1

Ted

Mogulmeister

Joined: 03 May 2007
Posts: 1151

Posted: Mon Apr 12, 2010 2:07 pm Post subject:

Nice one Ted - they're always good to find.

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