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Puzzle 11/08/13: ~ Advanced (BBDB?)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Aug 13, 2011 10:07 pm    Post subject: Puzzle 11/08/13: ~ Advanced (BBDB?) Reply with quote

Code:
 +-----------------------+
 | 7 6 3 | . . . | . 8 . |
 | 9 8 . | . . . | . 5 . |
 | 5 . 4 | 1 . . | . . 6 |
 |-------+-------+-------|
 | . . 5 | 8 . 2 | . 1 . |
 | . . . | . . 3 | . . . |
 | . . . | 4 1 7 | . . 3 |
 |-------+-------+-------|
 | . . . | . . . | 3 . . |
 | 1 3 . | 9 . . | . . . |
 | . . 8 | . . 6 | . . 1 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Aug 15, 2011 9:01 am    Post subject: Reply with quote

I tried to stay in rating - but after about four back-to-backs ... jumped ship
Code:
skyscraper(6) r67 ; r5c1<>6, r8c3<>6
skyscraper(4) r47 ; r5c8<>4, r89c7<>4
als-xz (6=9)r4c5 - (9=276)r4c9|r56c8 ; r4c7<>6

[Edit. To add initial skyscraper]


Last edited by peterj on Mon Aug 15, 2011 5:41 pm; edited 1 time in total
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susume



Joined: 13 May 2011
Posts: 36
Location: Southeastern US

PostPosted: Mon Aug 15, 2011 4:12 pm    Post subject: Reply with quote

Code:
+------------+-----------+-----------------+
| 7   6  3   | 25  25  9 | 1     8    4    |
| 9   8  1   | 36  36  4 | 27    5    27   |
| 5   2  4   | 1   7   8 | 9     3    6    |
+------------+-----------+-----------------+
| 3   47 5   | 8   69  2 | 467   1    79   |
| 246 1  267 | 56  569 3 | 24678 2467 2789 |
| 8   9  26  | 4   1   7 | 5     26   3    |
+------------+-----------+-----------------+
| 246 47 9   | 27  8   1 | 3     2467 5    |
| 1   3  267 | 9   24  5 | 24678 2467 278  |
| 24  5  8   | 237 234 6 | 247   9    1    |
+------------+-----------+-----------------+

Was there perhaps a move before your skyscraper, to get a strong link on 4 in r7? Skyscraper 6 r67 would do it. Or maybe I just missed something in basics.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Mon Aug 15, 2011 5:42 pm    Post subject: Reply with quote

susume wrote:
Was there perhaps a move before your skyscraper, to get a strong link on 4 in r7?

I culled one too many when I abandoned my "advanced" path Embarassed Thanks!
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue Aug 16, 2011 2:09 am    Post subject: Reply with quote

If Peter had continued his "Advanced" path.

Code:
 after basics
 +-----------------------------------------------------------------------+
 |  7      6      3      |  25     25     9      |  1      8      4      |
 |  9      8      1      |  36     36     4      |  27     5      27     |
 |  5      2      4      |  1      7      8      |  9      3      6      |
 |-----------------------+-----------------------+-----------------------|
 |  3      47     5      |  8      69     2      |  467    1      79     |
 |  246    1      267    |  56     569    3      |  24678  2467   2789   |
 |  8      9      26     |  4      1      7      |  5      26     3      |
 |-----------------------+-----------------------+-----------------------|
 |  246    47     9      |  27     8      1      |  3      2467   5      |
 |  1      3      267    |  9      24     5      |  24678  2467   278    |
 |  24     5      8      |  237    234    6      |  247    9      1      |
 +-----------------------------------------------------------------------+
 # 56 eliminations remain

 <47+2>  XY-Wing  r7c2/r7c4+r9c1         <> 2    r7c1,r9c45   extraneous

 r67c8   Skyscraper                      <> 6    r5c1,r8c3
 c38\r58 finned  X-Wing                  <> 7    r8c79        extraneous

 r47c2   Skyscraper                      <> 4    r89c7,r5c8

 <24+7>  XY-Wing  r9c1/r7c2+r9c7         <> 7    r7c8

   c38   X-Wing                          <> 7    r5c9 (,r8c9 from above)

 <47+2>  XY-Wing  r7c2/r7c8+r8c3         <> 2    r8c89
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Marty R.



Joined: 12 Feb 2006
Posts: 5162
Location: Rochester, NY, USA

PostPosted: Wed Aug 17, 2011 4:45 am    Post subject: Reply with quote

I used an XY-Wing, two XY-Chains, XY-Loop and an AIC.
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