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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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 Posted: Wed May 28, 2008 2:41 pm Post subject: Jellyfish - a rare species |
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Usually, the Times "Super Fiendish" sudoku can be solved using just x-wings or the odd swordfish. The February 15, 2008 puzzle number 1762, however, offered the rare opportunity to either use an xy-wing (38-23-28 in col 1 and row 9) or a jellyfish (3 rows 2,4,6,8 in cols 1,4,6,9).
For your convenience, I post a copy of the puzzle here:
| Code: |
+-----------+-----------+-----------+
| . . 9 | 2 . 8 | 3 . . |
| . 1 2 | . 4 . | 7 6 . |
| . . . | . . . | . . . |
+-----------+-----------+-----------+
| . 7 . | . 2 . | . 5 . |
| 4 . . | 8 . 9 | . . 7 |
| . 2 . | . 1 . | . 8 . |
+-----------+-----------+-----------+
| . . . | . . . | . . . |
| . 6 7 | . 8 . | 9 1 . |
| . . 4 | 1 . 6 | 5 . . |
+-----------+-----------+-----------+
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play online |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed May 28, 2008 3:21 pm Post subject: |
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Very interesting puzzle. Even knowing it contained a jellyfish, I did not spot it immediately. In fact, I noted the complimentary swordfish first and only after removing those eliminations did I see the jellyfish. Either eliminations actually solved the puzzle.
Thanks, nataraj, for a fun morning.
Ted |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed May 28, 2008 7:01 pm Post subject: |
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| Code: | .---------------------.---------------------.---------------------.
| 67 5 9 | 2 67 8 | 3 4 1 |
| 38 1 2 | 9 4 35 | 7 6 58 |
| 3678 4 368 | 3567 3567 1 | 28 9 258 |
:---------------------+---------------------+---------------------:
| 1689 7 168 | 346 2 34 | 146 5 39 |
| 4 3 156 | 8 56 9 | 16 2 7 |
| 569 2 56 | 34567 1 3457 | 46 8 39 |
:---------------------+---------------------+---------------------:
| 1235 89 135 | 3457 3579 23457 | 28 37 6 |
| 235 6 7 | 35 8 235 | 9 1 4 |
| 23 89 4 | 1 379 6 | 5 37 28 |
'---------------------'---------------------'---------------------' |
nataraj, are you aware that the font inside your parenthesis is white? at least from my point of view. I actually didn't see it in a previous posting until I got really close to the monitor. |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Wed May 28, 2008 8:03 pm Post subject: |
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| storm_norm wrote: |
nataraj, are you aware that the font inside your parenthesis is white? at least from my point of view. I actually didn't see it in a previous posting until I got really close to the monitor. |
Yes, Norm. That is to avoid spoiling the fun for those who read the post but don't want to see the full solution right away. I did not find "invisible" color but white serves just fine.
And there is a better method to make the text visible: just highlight the text with the mouse - it will then stand out white on blue background. Definitely easier on the eyes ...
Glad you liked the puzzle  |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Wed May 28, 2008 8:57 pm Post subject: |
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| Quote: | | That is to avoid spoiling the fun |
of course !!
and yes, very nice fishy in there the 3's make up the jelly fish, and the swordfish mentioned.
can we expect more "unspoiled" solutions from you?  |
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keith
Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
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| Posted: Wed May 28, 2008 11:21 pm Post subject: |
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How about this?
After basics: | Code: | +-------------------+-------------------+-------------------+
| 67 5 9 | 2 67 8 | 3 4 1 |
| 38a 1 2 | 9 4 35 | 7 6 5-8 |
| 367-8 4 36-8 | 3567 3567 1 | 28e 9 258 |
+-------------------+-------------------+-------------------+
| 1689 7 168 | 346 2 34 | 146 5 39 |
| 4 3 156 | 8 56 9 | 16 2 7 |
| 569 2 56 | 34567 1 3457 | 46 8 39 |
+-------------------+-------------------+-------------------+
| 1235 89 135 | 3457 3579 23457 | 28d 37 6 |
| 235 6 7 | 35 8 235 | 9 1 4 |
| 23b 89 4 | 1 379 6 | 5 37 28c |
+-------------------+-------------------+-------------------+ |
The XY-wing abc can be extended to de. Any cell that sees both a and e cannot be <8>.
This is not essential to solve the puzzle, but these multiple eliminations of <8> make the end game much easier.
Keith |
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