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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sun Aug 26, 2007 9:20 pm Post subject: Aug 26 VH |
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I found a compact xy-wing which eliminated the <8> at R3C6 and the puzzle opened up.
Earl |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Mon Aug 27, 2007 10:07 am Post subject: |
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| Code: |
+------------------+-------------+----------+
| 149 6 8 | 49 24 5 | 7 3 12 |
| 47 2 3 | 1 6 47 | 8 5 9 |
| 179 19 5 | 3789 38 289 | 12 4 6 |
+------------------+-------------+----------+
| 126 7 126 | 38 5 18 | 136 9 4 |
| 59 459 49 | 2 13 6 | 13 7 8 |
| 8 3 16 | 47 9 47 | 156 2 15 |
+------------------+-------------+----------+
| 3 45 24 | 458 18 128 | 9 6 7 |
| 12569 1459 12469 | 459 7 3 | 245 8 25 |
| 259 8 7 | 6 24 29 | 245 1 3 |
+------------------+-------------+----------+
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Play this puzzle online at the Daily Sudoku site
Me too!
Peter |
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George Woods
Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
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| Posted: Mon Aug 27, 2007 12:52 pm Post subject: yes indeed |
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| I did it this way, but noticed that getting a 2 at r7c3 relied on "factorising" col 6, the 2 aforementioned 2 falls out immediately by using the corresponding XY wing that removes the 8 from r7c4! |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Aug 27, 2007 1:56 pm Post subject: |
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I'm not sure I found the same thing - but I had to use a 13, 18, 38 set twice (both pivots on 13) - and then still needed a skyscraper on 9s (R19).
Probably missed an easy step. |
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Johan
Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium
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| Posted: Mon Aug 27, 2007 2:32 pm Post subject: |
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| The same xy-wing with pivot in R5C5, which results in a naked [129] triple in R3, and opens the puzzle. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Aug 27, 2007 3:50 pm Post subject: |
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| The XY-Wing on 13-18-38 solved it for me. Prior to that I played a Finned X-Wing which didn't matter, but I saw that move first. |
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sdq_pete
Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL
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| Posted: Mon Aug 27, 2007 4:16 pm Post subject: |
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Funny thing is, there are two 13-18-38 XY wings, as cgordon pointed out, both the same pivot, though I only used the 'top' one and don't recall requiring any 'advanced' techniques after that.
Peter |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Mon Aug 27, 2007 5:13 pm Post subject: |
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sdq_pete:
Yeah you are right - only one xy needed 38(R3)-18(R4)-13(R5)pivot.
After that nothing advanced - though I found it hard to spot the eliminations. Sudokued out maybe. |
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