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Set XY_02 Puzzle 43 -- Advanced

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Apr 24, 2009 12:13 am Post subject: Set XY_02 Puzzle 43 -- Advanced

Code:

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

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

VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, finned X-Wing, UR Type 2

Advanced: M-Wing, W-Wing, XYZ-Wing, XY-Chain, other URs

Extreme: Chain, Loop, SIN (Single Inference Network)

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Apr 24, 2009 4:45 am Post subject:

Code:

.------------------.------------------.------------------.
| 4 19 13 | 27 178 2389 | 5 389 6 |
| 7 8 35 | 34 6 3459 | 1 39 2 |
| 6 159 2 | 13 158 3589 | 389 4 7 |
:------------------+------------------+------------------:
| 135 2 158 | 6 158 358 | 4 7 9 |
| 13 7 6 | 134 9 348 | 38 2 5 |
| 9 4 58 | 27 578 2358 | 6 138 18 |
:------------------+------------------+------------------:
| 2 3 7 | 5 4 6 | 89 189 18 |
| 15 15 9 | 8 3 7 | 2 6 4 |
| 8 6 4 | 9 2 1 | 7 5 3 |
'------------------'------------------'------------------'

UR type 3 {1,8} removes 3 and 9 from r1c9
(3=1)r5c1 - (1)r5c4 = (1)r4c5 - (1=7)r1c5 - (7)r1c4 = (7-2)r6c4 = (2-5)r6c5 = (5-3)r6c6 = (3)r6c8; r5c7 <> 3

tlanglet

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

Posted: Tue Apr 28, 2009 2:51 am Post subject:

storm_norm wrote:

(3=1)r5c1 - (1)r5c4 = (1)r4c5 - (1=7)r1c5 - (7)r1c4 = (7-2)r6c4 = (2-5)r6c5 = (5-3)r6c6 = (3)r6c8; r5c7 <> 3

Norm, I am not into S&M, and your chain is way to much for me.
A w-wing 13 in r3c4 & r5c1 with strong link 3 in col 7 as a single step solution is much more to my liking.

Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue Apr 28, 2009 3:20 am Post subject:

very nice, I missed that one.

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