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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Jun 07, 2011 1:17 am Post subject: Puzzle 11/06/06: A XY (BBDB?) |
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| Code: | +-----------------------+
| 8 . . | . 6 7 | 1 . . |
| . 7 . | . 4 . | . . . |
| . . 6 | 1 2 . | 5 7 . |
|-------+-------+-------|
| . . 9 | 7 . 4 | 6 . . |
| 6 8 7 | . . . | 4 9 . |
| 5 . . | 6 . 9 | . . 1 |
|-------+-------+-------|
| 7 . 5 | 8 9 . | . 6 . |
| . . 8 | . 3 . | 9 1 7 |
| . . . | . . 6 | . 5 8 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue Jun 07, 2011 8:08 am Post subject: |
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A rather long xy-chain with a "twist" undoes it...
| Quote: | (2=3)r1c3 - (3=9)r1c4 - BUG-Lite(35-23-25)r258c46[(9)r2c4=(4)r8c4] - (4=2)r9c4 - (2=5)r8c6 - (5=3)r2c6 - (3=2)r2c8 ; r1c9<>2, r2c13<>2
Another way of thinking of it is as an almost-w-wing(23) where the strong link in the DP makes the fin cover the same eliminations |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Jun 08, 2011 4:17 am Post subject: |
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| Potential 35-23-25 DP in boxes 258. Either r2c4=9 or r8c4=4. Common outcome, r6c8=3. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Jun 08, 2011 5:20 am Post subject: |
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This puzzle was about grouped strong links!
| Code: | after basics
+-----------------------------------------------------------------------+
| 8 5 23 | 39 6 7 | 1 4 239 |
| 1239 7 123 | 359 4 35 | 8 23 6 |
| 349 349 6 | 1 2 8 | 5 7 39 |
|-----------------------+-----------------------+-----------------------|
| 123 123 9 | 7 5 4 | 6 8 23 |
| 6 8 7 | 23 1 23 | 4 9 5 |
| 5 234 234 | 6 8 9 | 7 23 1 |
|-----------------------+-----------------------+-----------------------|
| 7 23 5 | 8 9 1 | 23 6 4 |
| 24 6 8 | 245 3 25 | 9 1 7 |
| 12349 12349 1234 | 24 7 6 | 23 5 8 |
+-----------------------------------------------------------------------+
# 49 eliminations remain
M-Wing 6A: (3=9)r3c9 - r1c9 = (9-3)r1c4 = (3)r2c46 => r2c8<>3
M-Wing 7B: (3=9)r1c4 - r1c9 = (9-3)r3c9 = (3)r3c12 => r1c3<>3
W-Wing: (2=3)r1c3 - r3c12 = r3c9 - (3=2)r4c9 => r1c9<>2
W-Wing: (2=3)r1c3 - r3c12 = r3c9 - (3=2)r2c8 => r1c9,r2c13<>2
W-Wing: (2=3)r1c3 - r1c4 = r2c46 - (3=2)r2c8 => r1c9,r2c13<>2
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Jun 08, 2011 1:28 pm Post subject: |
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I initially spotted the "almost Bug-Lite"(235)r258c6, but made a second pass when I noticed that Marty had already posted the same solution.
How about a w-wing(23)r1c3|r4c9 with grouped SL(3)r3c129; r1c9<>2
Ted
[Edit: I started the puzzle yesterday prior to Danny's post, and did not check today to see if additional posts had been made. My solution is included in the list of grouped strong link provided by Danny.] |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Jun 08, 2011 3:24 pm Post subject: |
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| I should have waited longer before deciding to include my post. Sorry!!! |
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