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Puzzle 10/02/06 (A)

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Feb 06, 2010 3:39 pm Post subject: Puzzle 10/02/06 (A)

Code:

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

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Sat Feb 06, 2010 5:22 pm Post subject:

This was a very unusual puzzle for me in that I was unable to make even a single elimination from basics after populating the grid with candidates.

Quote:

Skyscraper (4) and XY-Wing (264)

arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Sat Feb 06, 2010 7:43 pm Post subject:

Basics got me here

Code:

*-----------------------------------------------------------------------------*
| 467 3468 3467 | 2 1 4679 | 3679 5 3689 |
| 24567 9 24567 | 3 478 4567 | 67 1 68 |
| 567 3568 1 | 68 78 5679 | 2 4 3689 |
|-------------------------+-------------------------+-------------------------|
| 3 1 24 | 9 6 24 | 8 7 5 |
| 8 46 469 | 7 5 3 | 469 2 1 |
| 24567 2456 245679 | 48 248 1 | 469 3 469 |
|-------------------------+-------------------------+-------------------------|
| 1 2346 8 | 46 2347 2467 | 5 9 34 |
| 9 7 34 | 5 34 8 | 1 6 2 |
| 2456 23456 23456 | 1 9 246 | 34 8 7 |
*-----------------------------------------------------------------------------*

Single step solution:

Quote:

(2=4)r4c3 - 4=3)r8c3 - (3)r8c5 = (3=2)r7c5 = (2)r6c5; r4c6,r6c123<>2

tlanglet

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

Posted: Sun Feb 07, 2010 3:47 pm Post subject:

I used two VH steps.

Quote:

skyscraper 4 which makes two key deletions to set up a
xy-wing -248 with vertex 48 in r6c4, pincer 28 in r6c5 and pincer 24 a pseudocell in box8.

Ted

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