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Set J Puzzle 45 -- busy VH+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sat Feb 07, 2009 10:03 pm    Post subject: Set J Puzzle 45 -- busy VH+ Reply with quote

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== Ratings are Accumulative

Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2

Basics+: Naked Quad, Hidden Pair/Triple/Quad

VH: BUG+1, UR Type 1, X-Wing, XY-Wing, XYZ-Wing

VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, Colors, UR Type 2

Advanced: finned X-Wing, Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain

Extreme: Jellyfish, (but mostly) Chain
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tlanglet



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

PostPosted: Mon Feb 09, 2009 3:37 pm    Post subject: Reply with quote

A nice VH+ puzzle with a variety of choices. I used four steps.
Quote:
Type 2 UR <48> to form subset <37> thereby deleting <37> from r4c9
Kite on <4> in box <9>
x-wing <7> in r49c58, and
xy-wing <348> with pivot <34> in r4c6.

Ted Smile
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Feb 09, 2009 7:34 pm    Post subject: Reply with quote

Code:
.---------------------.---------------------.---------------------.
| 4      7      2     | 5      3      1     | 8      9      6     |
| 9      3      1     | 6      48     48    | 7      2      5     |
| 6      5      8     | 7      2      9     | 3      4      1     |
:---------------------+---------------------+---------------------:
| 1      6      9     | 2      478    348   | 5      37     348   |
| 37     28     4     | 1      5      378   | 9      6      2378  |
| 37     28     5     | 348    9      6     | 24     1      23478 |
:---------------------+---------------------+---------------------:
| 8      4      3     | 9      1      27    | 6      5      27    |
| 2      9      7     | 34     6      5     | 1      8      34    |
| 5      1      6     | 348    478    2348  | 24     37     9     |
'---------------------'---------------------'---------------------'

this grid is after the x-wing on 7
then this chain
(8)r9c4 = (8)r6c4 - (8=2)r6c2 - (2)r6c7 = (2)r9c7 - (2)r7c9 = (2-7)r7c6 = (7)r9c5; r9c5 <> 8
xy-wing {2,4,7} elimantes 2 from r9c6 and r7c9
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Marty R.



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

PostPosted: Tue Feb 10, 2009 6:00 am    Post subject: Reply with quote

I used a useless W-Wing on 37 (because it was there), after which four ERs solved it.
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