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VH: Set A Puzzle 24

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Nov 09, 2008 6:32 pm    Post subject: VH: Set A Puzzle 24 Reply with quote

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

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keith



Joined: 19 Sep 2005
Posts: 3150
Location: near Detroit, Michigan, USA

PostPosted: Sun Nov 09, 2008 8:44 pm    Post subject: Reply with quote

Danny,

Nice puzzle! After basics:

Code:
+----------------+----------------+----------------+
| 1    9    2    | 5    48   478  | 3    6    47   |
| 48   3    67   | 26   1    47   | 578  245  9    |
| 48   67   5    | 26   3    9    | 78   24   1    |
+----------------+----------------+----------------+
| 7    248  48   | 1    6    2458 | 9    3    58   |
| 6    1    3    | 9    7    58   | 4    58   2    |
| 5    248  9    | 3    48   248  | 1    7    6    |
+----------------+----------------+----------------+
| 9    78   78   | 4    5    6    | 2    1    3    |
| 3    46   46   | 8    2    1    | 57   9    57   |
| 2    5    1    | 7    9    3    | 6    48   48   |
+----------------+----------------+----------------+
There is an XY-wing, but I am much more interested in the possibilities surrounding <48>. I see overlapping W-wings, ...

Edit: I now see the XY-wing makes it a 1-stepper.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5119
Location: Rochester, NY, USA

PostPosted: Sun Nov 09, 2008 11:53 pm    Post subject: Reply with quote

It probably would have been a one-stepper for me too, except for the sequence in which I did it. A W-Wing on 48 with pincer coloring takes out the 8s from r1c6 and r6c5. Then I used the Type 4 UR on 28 before my XY-Wing search and found the one that finished it off.
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