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Set J Puzzle 45 -- busy VH+

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Feb 07, 2009 10:03 pm Post subject: Set J Puzzle 45 -- busy VH+

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

tlanglet

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

Posted: Mon Feb 09, 2009 3:37 pm Post subject:

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

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Feb 09, 2009 7:34 pm Post subject:

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

Marty R.

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

Posted: Tue Feb 10, 2009 6:00 am Post subject:

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

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