Jellyfish ~ the rarest one method

Everything about Sudoku that doesn't fit in one of the other sections

here are some more jellyfishes - easy to find

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`6 . . 1 . 2 . . 5. 4 . . . . . 9 .. . . . . . 3 . .. . . . . 4 . . 1. . 2 . 7 . 5 . .5 . . 6 . . . . .. . 3 . 1 . . . .. 9 . . . . . 4 .1 . . 5 . 8 . . 2`

you can omit the 7 in the center, but then the WXYZ-Wing ( Aligned Pair Exclusion ) will be destroyed.

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`6 . . 1 . 2 . . 5. 4 . . . . . 6 .. . . . 8 . 3 . .8 . . . . 5 . . 1. . 2 . 7 . 9 . .5 . . 2 . . . . 3. . 3 . 6 . . . .. 8 . . . . . 4 .9 . . 5 . 8 . . 2`

And here is the fully grown up Jelly. And a continuous coloring chain.

Claudia
claudiarabia

Posts: 288
Joined: 14 May 2006

two times Unique Loop - a nice Jellyfish

This puzzle is one of the most amazing I ever made. If it wouldn't have this forcing chain with which you eliminate the 1 in r5c9 I would poste it to "No chains required". Perhaps somebody finds an atila or titila to circumwent this chain. The one unique loop has 8 cells the other 6.

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`. 8 . . . 3 . 1 .. . 7 . 1 . . . 2. . . . . 2 4 . .1 . 4 . . . . 2 .. . . 5 . . . . .. 3 . . . . 5 . 9. . 2 7 . . . . .9 . . . 2 . 3 . .. 7 . 4 . . . 8 .`
claudiarabia

Posts: 288
Joined: 14 May 2006

Actually it does solve without chains - all's it takes is a slightly out of the ordinary UR. After basic moves the puzzle is:
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`UR+2B/1SL (3,5): r79c15 => r9c1<>5+------------------+--------------+------------------+|     2    8   56  |  69   4   3  | 679     1   567  ||   346  469    7  | 689   1   5  | 689   369     2  ||   356  169   13  | 689   7   2  |   4  3569  3568  |+------------------+--------------+------------------+|     1    5    4  |   3   9   7  |  68     2    68  ||    68    2    9  |   5  68   4  |  17    37   137  ||     7    3   68  |   2  68   1  |   5     4     9  |+------------------+--------------+------------------+| 34568* 146    2  |   7  35* 68  | 169   569  1456  ||     9   46  568  |   1   2  68  |   3   567  4567  ||  36-5*   7   13  |   4  35*  9  |   2     8   156  |+------------------+--------------+------------------+`

The UR is like a Type 4, but instead of the strong link being between the two non-bivalued cells its between a bivalued and non-bivalued cell (r7c1=3=r7c5). If r9c1=5 then the strong link forces the deadly pattern. After that a hidden pair and the puzzle is solved.
Mike Barker

Posts: 458
Joined: 22 January 2006

New ER=5.2 puzzle.

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`7...9...3.8.7.5.1...........4...7.2.8.......6.5.8...7...........7.1.4.5.6...3...2`

57 x Hidden Single 1 x Direct Hidden Pair 1 x Naked Single 6 x Pointing 2 x Naked Pair 2 x X-Wing 2 x Hidden Pair 1 x Naked Triplet 1 x Swordfish 1 x Jellyfish
Eioru

Posts: 182
Joined: 16 August 2006

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