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Krampus Edition - "Nice" #2

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peterj

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

Posted: Wed Dec 08, 2010 6:09 pm Post subject: Krampus Edition - "Nice" #2

Code:

*-----------*
|.5.|.4.|...|
|...|9..|57.|
|3..|2..|.86|
|---+---+---|
|.6.|5..|9..|
|...|.7.|...|
|..2|..1|.3.|
|---+---+---|
|13.|..4|..7|
|.97|..3|...|
|...|.2.|.1.|
*-----------*

Code:

050040000000900570300200086060500900000070000002001030130004007097003000000020010

Marty R.

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

Posted: Thu Dec 09, 2010 5:51 am Post subject:

Code:

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

Play this puzzle online at the Daily Sudoku site

Nice #2 wasn't so nice. I practically went blind looking at all those 6s and 8s. But I clawed, scratched and hacked my way to a solution.

Two W-Wings, a UR, XY-Chain, Skyscraper and two XY-Wings left me at the brick wall. I finally found the finishing W-Wing on 68 by looking for strong links and then checking for Remote Pairs connected thereby instead of the reverse. It was flightless and with transport, r4c6<>8. Glad to have that one behind me.

peterj

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

Posted: Thu Dec 09, 2010 8:52 am Post subject:

My initial m-wing scan spotted a useful looking 2/9 strong link pair in column 9 - but I couldn't find an m-wing or s-wing to use it!

But Danny's l-wing came to the rescue...

Code:

l-wing(29) ; (9)r5c6=r9c6 - r9c9=(9-2)r1c9=r5c9 ; r5c6<>2

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