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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Aug 13, 2010 4:06 pm Post subject: Puzzle 10/08/13: D |
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| Code: | +-----------------------+
| . 4 . | 9 8 2 | . . . |
| 8 3 . | 4 . 1 | . 2 7 |
| . . 9 | . 7 . | . . . |
|-------+-------+-------|
| 3 7 . | 6 9 4 | . . 8 |
| 6 . 4 | 8 . . | . . . |
| 9 8 . | 2 . 7 | . 6 . |
|-------+-------+-------|
| . . . | . . . | . 7 . |
| . 6 . | . . 9 | 8 3 . |
| . 9 . | 7 . . | . . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site
| Rating wrote: | XY+ --> unlikely a single-stepper
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Fri Aug 13, 2010 8:54 pm Post subject: |
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The strong-link in a UR making a contradiction for a nice one-stepper... 
| Quote: | | (5)r2c5 - r56c5=r5c6 - UR(38)r79c36:(5)r79c6=(6)r7c6 - r3c6=r2c5 ; r2c5<>5 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sat Aug 14, 2010 1:58 pm Post subject: |
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I noticed that Marty was having so much success and fun working the URs, that I decided to look at them for this puzzle.
| Quote: | AUR (38)r79c36 rquires r79c6=5 or r7c6=6
(5)r79c6-r5c6=r56c5-(5=6)r2c5
(6)(r7c6 - r3c6=(6)r2c5 |
After completing the puzzle, I noticed the similarity to Peter's solution; they are complimentary solutions.
Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 15, 2010 9:02 pm Post subject: |
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After basics I was staring at what seemed to be an impossible puzzle. I finally noticed that I had missed a 12567 quint in c3.
After that I looked at the potential DP (38) in boxes 78 and quickly determined that r79c6<>5. After that the 38s became a puzzle-ending Type 1 UR. |
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