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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Wed Apr 01, 2009 3:45 am Post subject: Set T_03 Puzzle 15 |
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VH+
| Code: | +-----------------------+
| . . . | . . 5 | 8 . . |
| . 6 . | 9 . 7 | . 3 2 |
| . . 7 | . 3 . | . . . |
|-------+-------+-------|
| . 2 . | 1 . . | . . 3 |
| . . 8 | . 5 . | . . . |
| 5 7 . | . . 9 | . . 8 |
|-------+-------+-------|
| 2 . . | . . . | . 7 1 |
| . 1 . | . . . | 3 . . |
| . 8 . | 5 . 3 | 2 . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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gindaani
Joined: 06 Mar 2009
Posts: 79
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| Posted: Fri Apr 03, 2009 7:51 pm Post subject: |
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No solutions yet, so here is mine.
I found 4 x-wings, which may or may not be necessary. After that:
| Code: |
+-----------+------------+-----------+
| 13 39 2 | 46 46 5 | 8 19 7 |
| 4 6 15 | 9 8 7 | 15 3 2 |
| 8 59 7 | 2 3 1 | 569 569 4 |
+-----------+------------+-----------+
| 69 2 69 | 1 7 8 | 45 45 3 |
| 13 4 8 | 36 5 26 | 7 126 9 |
| 5 7 13 | 346 246 9 | 16 26 8 |
+-----------+------------+-----------+
| 2 35 35 | 8 69 46 | 49 7 1 |
| 69 1 469 | 7 29 24 | 3 8 5 |
| 7 8 49 | 5 1 3 | 2 49 6 |
+-----------+------------+-----------+
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Play this puzzle online at the Daily Sudoku site
There is a UR that solves this one pretty quickly.
If you ignore the UR, Advanced Coloring leads to a contradiction.
Or there is the rather long chain:
31-19-94-49-96-64-42-26-63 => r5c1<>3 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Apr 04, 2009 12:29 am Post subject: |
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I used two x-wings and a finned x-wing to get to the code posted by gindaani and then took the easy Type 1 UR to complete the puzzle. Later I returned to this puzzle and found a 4-cell xy-chain that does the dirty deed: 51-19-94-45; r3c8<>5.
Also, a Type 4 UR46 and a xy-chain will complete the puzzle.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Apr 07, 2009 9:22 pm Post subject: |
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| I used four ERs, two X-Wings, Type 4 UR and an XY-Chain. |
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