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Set NNP_2 Puzzle 82

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Feb 23, 2009 5:00 pm Post subject: Set NNP_2 Puzzle 82

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Mon Feb 23, 2009 6:04 pm Post subject:

Two steps:

Quote:

Back-to-back x-wings <7>.

Ted

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Feb 23, 2009 7:47 pm Post subject:

Ted: I can't duplicate your results.

tlanglet

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

Posted: Mon Feb 23, 2009 10:28 pm Post subject:

daj95376 wrote:

Ted: I can't duplicate your results.

My Turn

The first x-wing is right after basics. The second x-wing was not valid. I thought it was in r25c36 to delete <7> in r6c9, but col <6> contains another digit <7>.

Sorry ......... I will have to look for another solution.

Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue Feb 24, 2009 5:21 am Post subject:

this is the grid after the x-wing on 7 and the skyscraper on 8's

Code:

.------------------.------------------.------------------.
| 5 17 3 | 8 17 6 | 2 9 4 |
|*28 9 *278 | 4 *23 237 | 5 1 6 |
| 6 12 4 | 9 125 25 | 7 3 8 |
:------------------+------------------+------------------:
| 9 37 6 | 1 *37 4 | 8 5 2 |
| 238 2358 *278 | 6 9 *2357 | 1 4 *37 |
| 4 235 1 | 27 *235 8 | 9 6 37 |
:------------------+------------------+------------------:
| 7 6 9 | 3 8 1 | 4 2 5 |
| 1 4 5 | 27 6 27 | 3 8 9 |
| 238 238 28 | 5 4 9 | 6 7 1 |
'------------------'------------------'------------------'

then the result of the 5 and 7 gone from r2c5, leaves 2 and 3 which makes this nice chain. this chain makes an elimination in one cell and moves on to make another elimination.
(2=3)r2c5 - (3)r46c5 = (3)r5c6 - (3=7)r5c9 - (7)r5c3 = (7)r2c3; r2c3 <> 2
(2=3)r2c5 - (3)r46c5 = (3)r5c6 - (3=7)r5c9 - (7)r5c3 = (7-8)r2c3 = (8)r2c1; r2c1 <> 2

tlanglet

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

Posted: Tue Feb 24, 2009 2:27 pm Post subject:

On my second attempt to find a valid solution for this puzzle, I found:

Quote:

my original x-wing <7>, the skyscraper on <8> noted by Norm and a xy-wing <237> with pivot <37> in r4c5 making one deletion on <2> and, after some cleanup, transporting <2> in pincer r2c5 => r3c5 => r3c2 makes another deletion and completes the puzzle.

Ted

Marty R.

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

Posted: Tue Feb 24, 2009 10:01 pm Post subject:

Two ERs did it for me.

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue Feb 24, 2009 11:08 pm Post subject:

Marty R. wrote:

Two ERs did it for me.

Marty,
might want to recheck that.

Marty R.

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

Posted: Wed Feb 25, 2009 12:22 am Post subject:

storm_norm wrote:

Marty R. wrote:

Two ERs did it for me.

Marty,
might want to recheck that.

I did as soon as I opened this thread and saw the other responses. After the ERs I needed an XY-Wing and a W-Wing.

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