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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Thu Jul 28, 2011 7:24 pm Post subject: Puzzle 11/07/29: ~ XY (difficult?) |
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| Code: | +-----------------------+
| . . . | . 7 9 | 3 5 6 |
| . 3 9 | . . . | . 7 . |
| . 7 6 | . 5 8 | 9 . 4 |
|-------+-------+-------|
| . . . | 7 . . | . 2 . |
| 6 . 3 | . 8 . | . . . |
| 7 . 5 | . . 2 | . . 8 |
|-------+-------+-------|
| 4 . 7 | . . . | 5 . . |
| 3 5 . | 6 . . | . 8 . |
| 9 . 8 | . . 7 | . . 3 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Thu Jul 28, 2011 9:09 pm Post subject: |
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Won't even look for a one-shot because I simply cannot resist the little pattern in the first step.
| Code: | *-----------------------------------------------------------*
| 18 48 14 | 2 7 9 | 3 5 6 |
| 5 3 9 | 14 146 146 | 8 7 2 |
| 2 7 6 | 3 5 8 | 9 1 4 |
|-------------------+-------------------+-------------------|
| 18 489 14 | 7 3 456 | 46 2 59 |
| 6 2 3 | 149 8 15 | 147 49 1579 |
| 7 49 5 | 149 146 2 | 146 3 8 |
|-------------------+-------------------+-------------------|
| 4 16 7 | 8 2 3 | 5 69 19 |
| 3 5 2 | 6 9 14 | 147 8 17 |
| 9 16 8 | 5 14 7 | 2 46 3 |
*-----------------------------------------------------------* |
| Quote: | (148)BUG-Lite r14c123 =>r4c2=9
Any one of the available w-wings mops up. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Jul 29, 2011 4:56 am Post subject: |
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| Same as Luke; this type of solution was not expected. |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Fri Jul 29, 2011 10:06 pm Post subject: |
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I also initially found the BUG-Lite, so I made a second pass and found a xy-wing with a two fins.
aaxy-wing(46-1)b5q38+r8c6 with two fins: (5)r4c6 and (4)r6c5; r5c6, r9c5<>1
xy-wing (46-1) b5q38+r8c6;
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(5)r4c6-(5=9)r4c9-(9=1)r7c9-r8c79=r8c6;
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(4)r6c5-(4=9)r6c2-r4c2=r4c9-(9=1)r7c9-r8c79=r8c6;
Ted |
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