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Swordfish

 
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Thu Jan 15, 2009 10:12 pm    Post subject: Swordfish Reply with quote
I was trolling for puzzles with big fish, because Keith and I had questions.

Here is a puzzle with a swordfish, hard to ignore without chains or colors.
Code:

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



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jan 21, 2009 11:42 pm    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 358   158   2    | 578   57    9    | 4     138   6    |
| 689   4     689  | 1     28    3    | 5     29    7    |
| 7     158   3589 | 458   6     24   | 38    29    13   |
:------------------+------------------+------------------:
| 2     6     4    | 79    79    1    | 38    38    5    |
| 358   58    7    | 48    238   24   | 1     6     9    |
| 138   9     138  | 6     38    5    | 7     4     2    |
:------------------+------------------+------------------:
| 4     3     19   | 2     19    7    | 6     5     8    |
| 156   2     156  | 3     15    8    | 9     7     4    |
| 589   7     589  | 59    4     6    | 2     13    13   |
'------------------'------------------'------------------'

skipping the swordfish is crazy, but this is my path after many hours of staring at it.
(8)r9c3 = (8-9)r9c1 = (9-6)r2c1 = (6)r2c3; r2c3 <> 8
(1)r8c5 = (1)r7c5 - (1=9)r7c3 - (9=6)r2c3 - (6)r8c3 = (6)r8c1; r8c1 <> 1
(9=2)r2c8 - (2=8)r2c5 - (8)r6c5 = (8)r6c3 - (8)r9c3 = (8-9)r9c1 = (9)r2c1; r2c3 <> 9
(5=3)r5c1 - (3=8)r6c3 - (8)r9c3 = (8)r9c1; r9c1 <> 5
xy-wing (8=9)r2c1 - (9=3)r3c3 - (3=8)r3c7; r3c2 <> 8
xy-wing (3=5)r1c1 - (5=1)r3c2 - (1=3)r3c9; r3c9 <> 3... done.
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