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Puzzle 11/06/17: ~ Extreme (BBDB!)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Jun 17, 2011 5:29 pm    Post subject: Puzzle 11/06/17: ~ Extreme (BBDB!) Reply with quote

In my current batch of XY puzzles, I'm out of puzzles that solve with an initial M/W-Wing. This puzzle was the next one available, so I decided to post it even though XY puzzles are also available.

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

Play this puzzle online at the Daily Sudoku site

[Edit: corrected date of puzzle in the title.]
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peterj



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

PostPosted: Sat Jun 18, 2011 7:50 am    Post subject: Reply with quote

Following Danny's hint on extremes, I looked for x-cycles/fish.
Here's a neat two step...
Quote:
grouped x-cycle(5) ; (5)r5c3=r5c9 - r9c9=r9c4 - r7c456=r7c3 {loop} ; r368c3<>5, r46c9<>5
s-wing(12) (2)r5c3=r5c9 - (2=1)r4c9 - (1)r4c4=r6c3 ; r6c3<>2
It was also available as a one-step-almost...
Quote:
s-wing(12)[(2)r5c3=(1)r6c3]=(5)r4c9 - r9c9=r9c4 - r7c456=r7c3 - (5=2)r5c3 ; r6c3<>2
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sat Jun 18, 2011 2:02 pm    Post subject: Reply with quote

Ole Faithful..........

Quote:
anp(25=1)r54c9-r4c2=(1-2)r6c3=r5c3-(2=5)r5c9; b6q179<>5

Ted
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peterj



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

PostPosted: Sat Jun 18, 2011 4:22 pm    Post subject: Reply with quote

tlanglet wrote:
Ole Faithful..........

That'll do it! Smile
Often the case that an anp/ant skips some turbot/fish move. Your move is basically the m-wing complement of my s-wing uncovered by the x-cycle. Gets there quicker!
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Sat Jun 18, 2011 6:07 pm    Post subject: Reply with quote

tlanglet wrote:
Ole Faithful..........
Quote:
anp(25=1)r54c9-r4c2=(1-2)r6c3=r5c3-(2=5)r5c9; b6q179<>5

Ted, you're going to have to hip me to the new notation. I see four elims on (5), so one would think I'd be able to figure out what b6q179 means. Box 6, quadrant...hmmm?
Code:
  *--------------------------------------------------------------------*
 | 2      3      8      | 1      45     45     | 7      6      9      |
 | 45     15     145    | 6      9      7      | 38     2      38     |
 | 6      7      9      | 8      23     23     | 1      5      4      |
 |----------------------+----------------------+----------------------|
 | 359    159    6      | 7      8      2359   | 59     4      125    |
 | 7      8      25     | 4      1      69     | 69     3      25     |
 | 359    4      1235   | 359    235    23569  | 5689   7      1258   |
 |----------------------+----------------------+----------------------|
 | 8      6      35     | 359    345    3459   | 2      1      7      |
 | 3459   59     345    | 2      7      1      | 35     8      6      |
 | 1      2      7      | 35     6      8      | 4      9      35     |
 *--------------------------------------------------------------------*
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Sat Jun 18, 2011 8:30 pm    Post subject: Reply with quote

Luke,

I picked up this notation from Danny some time ago. The "b" is the normal reference to "box", and the "q" is a reference to the "cell" within the box counting left-to-right & top-to-bottom.

So, "b6q179" refers to cells r4c6, r6c7 and r6c9 respectively for three eliminations. As you noted, I failed to see the fourth elimination in r9c9. Embarassed

Ted
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Sat Jun 18, 2011 11:19 pm    Post subject: Reply with quote

Okay sure, thanks. I can see how that would be convenient shorthand when there's a lot of eliminations in the same box.
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