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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Mar 22, 2011 4:06 pm Post subject: Puzzle 11/03/22: ~ Difficult BBDB? |
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| Code: | +-----------------------+
| . 8 . | . . 2 | . 6 9 |
| 9 . . | 3 . 6 | . 4 . |
| . . 6 | . . . | . 3 . |
|-------+-------+-------|
| . 9 . | 2 . . | . . 3 |
| . . . | . . 7 | . . 6 |
| 6 7 . | . 3 9 | 4 . . |
|-------+-------+-------|
| . . . | . . 5 | 3 . 4 |
| 8 6 4 | . . . | . . 1 |
| 5 . . | 8 9 . | 6 2 . |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Mar 22, 2011 10:31 pm Post subject: |
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I think I stumbled in through a back trapdoor!
code after basics:
| Code: | *--------------------------------------------------------------------*
|@13 8 1357 | 145 457 2 | 17 6 9 |
| 9 15 1257 | 3 578 6 | 1278 4 258 |
|#12 4 6 | 9 578 #18 | 1278 3 258 |
|----------------------+----------------------+----------------------|
| 4 9 58-1 | 2 6 #18 | 58 7 3 |
|#123 135 12358 | 145 458 7 | 2589 159 6 |
| 6 7 28 | 15 3 9 | 4 15 28 |
|----------------------+----------------------+----------------------|
| 7 2 9 | 6 1 5 | 3 8 4 |
| 8 6 4 | 7 2 3 | 59 59 1 |
| 5 13 13 | 8 9 4 | 6 2 7 |
*--------------------------------------------------------------------* |
Kraken skyscraper (1)c16r3, marked #, with Kraken fin (1)r1c1, marked @; r4c3<>1
If fin is true: (1-3)r1c1=r5c1-r5c2=r9c2-(3=1)r9c3;
Ted
[daj Edit: changed r34c6 to c16r3] |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 23, 2011 8:21 am Post subject: |
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Ted, very nice spot 
I like almost-patterns - but the coolest  as Danny was alluding to - are the ones where the fin is actually true and the pattern is an illusory transient thing that doesn't appear in the solution path.
FWIW You can delete the fin with a transported s-wing(13)
| Code: | | s-wing(13) ; (3)r1c1=r1c3 - (3=1)r9c3 - (1)r4c3=r4c6 - r3c6=r1c4 ; r1c1<>1 |
[daj Edit: changed 1=3 to 3=1.] |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Mar 23, 2011 4:02 pm Post subject: |
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My previous comments aside, I admire a short, clean chain -- even if it's for a fin candidate.  In Ted's case, the fin chain can be reduced to: (1-3)r1c1 = r1c3 - (3=1)r9c3. (I derived this alternative before Peter posted his chain.) |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 23, 2011 10:54 pm Post subject: |
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XY-Wing (581)
Type 1 UR (59)
XY-Loop |
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