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Puzzle 11/06/18: ~ XY (BBDB)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Jun 18, 2011 10:42 pm    Post subject: Puzzle 11/06/18: ~ XY (BBDB) Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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JC Van Hay



Joined: 13 Jun 2010
Posts: 364
Location: Charleroi, Belgium

PostPosted: Sun Jun 19, 2011 8:38 am    Post subject: Reply with quote

Colouring on 7s : interpretation :
    Jellyfish 7R2469 : 7r2c8=7r2c7-7r9c7=Skyscraper(7r9c53 7r4c52)-7r6c3=7r6c8 loop => -7r8c7,-7r5c8
    Swordfish 7R479 : 7r4c2=7r4c5-7r79c5=[7r9c3=7r9c7-7r7c9=7r7c23] => -7r8c2; Claiming(7)B8 => -7r79c5
    Swordfish 7R269 : 7r6c3=7r6c8-7r2c8=r2c7-7r9c7=7r9c3 => -7r7c3
ER 8R4B1 : 8r4c4=8r4c1-8r23c1=8r1c3 => -8r1c4
Extended Kite(7R4C3) : 7r4c5-(7=4)r5c6 OR 7r9c3-(7=8)[r6c3 AND r9c7]-8r1c37=8r1c6 => -4r1c6
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Jun 19, 2011 11:17 am    Post subject: Reply with quote

JC: an interesting Jellyfish!

Your cells can also be used in what ronk would (probably) call a Jellyfish with a remote fin cell. Since I almost never recognize the presence of a remote fin cell, seeing it was a surprise.

Code:
 Sashimi Jellyfish r2469\c3578 w/remote fin cell r4c2
 (7): r4c2 - r6c3 = r6c8 - r2c8 = r2c7  =>  r5c8,r8c7<>7
 +--------------------------------------------------------------+
 |  7     2     18    |  468   4689  489   |  1489  5     3     |
 |  89    4     5     |  3     2     1     | *789  *78    6     |
 |  189   6     3     |  7     5     489   |  1489  2     48    |
 |--------------------+--------------------+--------------------|
 |  148  @178   2     |  48   *1478  5     |  6     3     9     |
 |  16    3     9     |  2     16    478   |  5     78-4  78    |
 |  468   5    *78    |  468   39    39    |  2    *478   1     |
 |--------------------+--------------------+--------------------|
 |  5     178   1478  |  9     478   2     |  3     6     478   |
 |  2     78    6     |  1     3478  3478  |  78-4  9     5     |
 |  3     9    *478   |  5    *478   6     | *478   1     2     |
 +--------------------------------------------------------------+
 # 71 eliminations remain

Subsequent moves as traditional fish:

Code:
finned Franken Swordfish r489\c25b9 w/fin cells r79c3  =>  r8c2<>7
               Swordfish r269\c378                     =>  r7c3<>7
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peterj



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

PostPosted: Sun Jun 19, 2011 1:23 pm    Post subject: Reply with quote

The big fish were safe from me!
Four steps ...
Quote:
kite(7) r4, c6 ; r8c2<>7
skyscraper(7) c6, c9 ; r7c5<>7, r8c7<>7
m-wing(78) ; (8=7)r2c8 - r6c8=(7-8)r6c3=r1c3 ; r1c7<>8, r2c1<>8
xy-chain ; (1=8)r3c1 - (8=9)r3c6 - (9=6)r1c5 - (6=1)r5c5 ; r5c1<>1
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Marty R.



Joined: 12 Feb 2006
Posts: 5121
Location: Rochester, NY, USA

PostPosted: Mon Jun 20, 2011 4:30 am    Post subject: Reply with quote

Skyscraper; r7c5, r8c7<>7
Kite; r3c6<>4
Skyscraper; r5c6, r9c5<>7

The big fish were in even less danger from me than from Peter. Exclamation
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tlanglet



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

PostPosted: Mon Jun 20, 2011 1:33 pm    Post subject: Reply with quote

I found this puzzle to be a definite challenge; four steps was my best effort. I did find some involved steps that were fun but scotch at dawn is a little crazy.........

Here is a set of four that does the deed.

Kite (7) with pivot b5; r8c2<>7

axy-wing (18-9) vertex (18)r1c3 with fin (48)r1c7; r2c7<>9
If fin is true: (48)r1c7-(1)r1c7=r1c3-als(1=47)r79c3-(7)r6c3=r6c8-(7=8)r2c8-(8=9)r2c1;

axy-wing (18-6) vertex (18)r3c1 with pseudocell pincer (68) in b2q92 and fin(4)r1c5; r5c5<>6
If xy-wing is true: (6=1)r5c1-(1=8)r3c1-(8=9)r3c6-(9=6)r1c5;
If fin is true: (4)r1c5-r789c5=r8c6-(4=7)r8c7-r7c9=r5c9-r5c6=(7-1)r4c5=(1-6)r5c5;

Coloring (7)

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5121
Location: Rochester, NY, USA

PostPosted: Mon Jun 20, 2011 4:30 pm    Post subject: Reply with quote

I'm withdrawing my solution, as it appears a mechanical error was made. I can't do it based on Danny's grid above. Embarassed
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