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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Oct 22, 2009 6:26 pm Post subject: Puzzle NR_074 |
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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: | +-----------------------+
| 1 8 . | . . 3 | 9 . 2 |
| 3 . . | . 8 . | . . . |
| . . 6 | . 2 . | 8 3 . |
|-------+-------+-------|
| . . . | 8 . . | 5 . . |
| . 1 5 | . . . | . 9 . |
| 8 . . | . . 1 | 3 . . |
|-------+-------+-------|
| 6 . 1 | 3 . 2 | 4 . . |
| . . 2 | . 9 . | . . . |
| 4 . . | . . . | . . . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Oct 23, 2009 5:36 pm Post subject: |
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kite
xyz-wing
ur type 1 |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Fri Oct 23, 2009 6:43 pm Post subject: |
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here is a two stepper.
the UR 17 in r28c78 says that the 4 in r2c8 and the 56 pair in r18c8 can't both be false. leads to the above chain/image, which eliminates the 5 in r9c8 and the 7 in r8c8.
leads to a xyz-wing to finish. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Oct 25, 2009 11:08 pm Post subject: |
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| Remote Pairs (56) and XYZ-Wing (279). |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Oct 27, 2009 4:21 am Post subject: |
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I also found a two step solution.
Remote Pair 56 in r1c8, r2c9, r2c6 & r9c6; r9c8<>5
xy-wing 27-9 with vertex 27 in r5c4, pincer 79 in r4c6, and pincer 27: (2)r5c4 - (2=7) r5c1 - (7=5)r8c1 - (5=9)r3c1; r3c6, r4c1<>9
Ted |
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Tue Oct 27, 2009 9:29 am Post subject: |
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| Check the "9:s" in column 1. A quick examination shows it can't be the 9 in row 4. And as this is a one-stepper the 9 in r3c1 gives the solution. |
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