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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Oct 29, 2009 3:04 am Post subject: Puzzle NR_077 |
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| Code: | NR puzzles can be solved using these techniques:
Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidates 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,
XYZ-Wing, finned X-Wing, UR Type 2/4
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| Code: | +-----------------------+
| . . . | . 4 . | . . . |
| . 8 . | 9 . 6 | . . 7 |
| . . 3 | . 1 7 | . 6 4 |
|-------+-------+-------|
| . 6 . | 5 . 2 | . 9 . |
| 5 . 8 | . . . | . . . |
| . 7 9 | 4 . 3 | 6 . . |
|-------+-------+-------|
| . . . | . . 4 | . . . |
| . . 7 | 1 . . | . . . |
| . 9 5 | . . . | . . 2 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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| Posted: Thu Oct 29, 2009 8:13 am Post subject: |
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I needed two steps
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Thu Oct 29, 2009 9:09 pm Post subject: |
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After basic, I only worked with the bivalue cells and it required 4 steps to complete the puzzle.
xy-wing 1-24 with vertex 14 in r4c3,
xy-wing -124 with vertex 24 in r5c2,
xy-wing -134 with vertes 34 in r8c2 and pseudocell 14 in box 4,
a chain: (4)r4c3 - (4=2)r2c3 - (2=3)r2c5 - (3=6)r9c5 - (6=4)r9c1 - (4)r8c2 = (4)r5c2; r4c3<>4
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sat Oct 31, 2009 5:05 am Post subject: |
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| I used a couple of XY-Wings (142, 241), three ERs (2,2,4) and finished with a W-Wing (14). |
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