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ravel
Joined: 21 Apr 2006
Posts: 536
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 Posted: Fri Feb 01, 2008 9:10 am Post subject: Jellyfish |
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| Code: | +-------+-------+-------+
| . . 1 | . . . | 4 . . |
| . 3 2 | . . . | 1 8 . |
| 5 4 . | . . . | . 3 6 |
+-------+-------+-------+
| . . . | 1 . 3 | . . . |
| . . . | 6 4 2 | . . . |
| . . . | 7 . 8 | . . . |
+-------+-------+-------+
| 8 1 . | . . . | . 7 2 |
| . 2 7 | . . . | 3 4 . |
| . . 5 | . . . | 8 . . |
+-------+-------+-------+
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>>> play online
I did not spot it. Instead i solved it with a variant of w-wing. A couple of basics, before you get the first number. You will also need a wing, before the fish appears. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Fri Feb 01, 2008 4:42 pm Post subject: |
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Ravel, my curiosity has got the best of me. You have posted three puzzles that have the same number of givens and in the same cells. That can't be a coincidence.  |
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nataraj
Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria
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| Posted: Fri Feb 01, 2008 5:38 pm Post subject: |
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I did meet a jellyfish. If I hadn't been on the lookout, who knows?
xyz-wing 259,
coloring 9: -r3c3=r3c7-r2c9=r8c9-r8c1=r9c2- ; r1c2<>9,
w-wing (59) r5c8 to r6c2 and
UR 59 => r6c2=5
ta daa - the jellyfish! Here 9 in rows 3,4,5,9 is confined to cols 2,3,7,8 and 9 in r1c8 is toast.
| Code: |
+--------------------------+--------------------------+--------------------------+
| 679 68 1 | 3 28 59 | 4 259 57 |
| 79 3 2 | 459 6 459 | 1 8 579 |
| 5 4 89 | 28 17 17 | 29 3 6 |
+--------------------------+--------------------------+--------------------------+
| 24 789 689 | 1 5 3 | 2679 269 48 |
| 1 789 389 | 6 4 2 | 579 59 38 |
| 24 5 36 | 7 9 8 | 26 1 34 |
+--------------------------+--------------------------+--------------------------+
| 8 1 4 | 59 3 569 | 569 7 2 |
| 69 2 7 | 589 18 1569 | 3 4 59 |
| 3 69 5 | 24 27 47 | 8 69 1 |
+--------------------------+--------------------------+--------------------------+
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One more coloring elimination 9:-r1c6=r1c1-r3c3=r3c7-r2c9=r8c9- ; r8c6<>9
One last xy-wing 29-25-59
and ?
- done. |
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ravel
Joined: 21 Apr 2006
Posts: 536
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| Posted: Fri Feb 01, 2008 7:54 pm Post subject: |
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| Marty R. wrote: | | Ravel, my curiosity has got the best of me. You have posted three puzzles that have the same number of givens and in the same cells. That can't be a coincidence. |
I already mentioned, that i like to take puzzles from the Patterns Game thread. The guys try to find as much as possible puzzles with different "Sudoku Explainer" ratings to a given pattern. About each week or 10 days a new game is started. They have 2 ratings now, so i am not sure, what exactly they mean, but puzzles with ratings between 4.2 and 7.3 (harder) often seem to be interesting. You will always find the name of the discoverer (e.g. TTHsieh, JPF, gsf or m_bmetcalf), when i post a puzzle here.
nataraj,
rechecking the puzzle now i saw, that there already is a jellyfish after basics (xyz- or w-wing are not needed), and it eliminates 3 numbers. But a wing (another one) is needed after it to solve the puzzle. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Sat Feb 02, 2008 12:07 am Post subject: |
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Marty,
Ravel is being way too modest and I am sure he will never tell you that he probably has hundreds more like it.
norm |
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