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

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daj95376

Joined: 23 Aug 2008
Posts: 3854

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

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

peterj

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

Posted: Mon Aug 15, 2011 9:01 am Post subject:

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

susume

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

Posted: Mon Aug 15, 2011 4:12 pm Post subject:

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.

peterj

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

Posted: Mon Aug 15, 2011 5:42 pm Post subject:

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!

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Aug 16, 2011 2:09 am Post subject:

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

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Wed Aug 17, 2011 4:45 am Post subject:

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

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