One from Phil

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One from Phil

Postby pjb » Thu May 21, 2026 2:06 am

Code: Select all
 *-----------*
 |8..|6..|..2|
 |...|..5|76.|
 |...|.9.|.1.|
 |---+---+---|
 |...|..1|.9.|
 |...|.7.|5..|
 |.6.|2..|..3|
 |---+---+---|
 |5.9|...|...|
 |7..|3..|...|
 |.16|...|..8|
 *-----------*   
pjb
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Re: One from Phil

Postby Cenoman » Thu May 21, 2026 9:36 pm

Code: Select all
 +--------------------------+-------------------------+------------------------+
 |  8       579-4   57-4    |  6      1      a47      | h349   h345     2      |
 |  12349   2349    1234    |  8      23      5       |  7      6      g49     |
 |  6       23457   23457   | b47     9       23      |  8      1      g45     |
 +--------------------------+-------------------------+------------------------+
 |  34      578     578     | c45     36      1       |  2      9      f467    |
 |  12349   2349    1234    | c49     7       36      |  5      8      f146    |
 |  19-4    6       57      |  2     d458    d489     | e14    e47      3      |
 +--------------------------+-------------------------+------------------------+
 |  5       2348    9       |  1      2468    24678   |  346    2347    7-4    |
 |  7       248     248     |  3      24568   24689   |  1469   245     159-4  |
 |  234     1       6       |  579-4  245     2479    |  349    23457   8      |
 +--------------------------+-------------------------+------------------------+

An amazing X-cycle in boxes 2,3,5,6 (all Empty Rectangles in the 4's):
(4)r1c6 = r3c4 - r45c4 = r6c56 - r6c78 = r45c9 - r23c9 = r1c78 loop => -4 r1c23, r9c4, r6c1, r78c9; ste

Thanks for the puzzle !
Cenoman
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Re: One from Phil

Postby pjb » Fri May 22, 2026 1:55 am

Cenoman - spot on. It's one from my large collection of SK loops and related loops on my website.
Cheers, Phil
pjb
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Posts: 2765
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Location: Sydney, Australia

Re: One from Phil

Postby RSW » Fri May 22, 2026 5:28 am

If my solver's chain finder is able to find a one step solution, the chain rarely has more than about 8 links. So this was a bit of a surprise.
I normally wouldn't post anything this ridiculous but it might be good for a laugh.

Code: Select all
 +---------------------+--------------------+---------------------+
 | 8      579-4 d457   | 6     1    dh47    |ci39-4 ci35-4   2    |
 | 12349  2349   1234  | 8     23     5     |  7      6    bj49   |
 | 6      23457  23457 | 47    9      23    |  8      1    bj45   |
 +---------------------+--------------------+---------------------+
 | 34     578    578   | 45    36     1     |  2      9    ak467  |
 | 2349-1 2349   234-1 | 49    7      36    |  5      8    ak146  |
 |m149    6     e57    | 2    f458    489   | L4-1    47     3    |
 +---------------------+--------------------+---------------------+
 | 5      2348   9     | 1    g2468  g24678 |  346    2347 ak47   |
 | 7      248    248   | 3    g24568 g24689 |  1469   245    459-1|
 | 234    1      6     | 4579 g245   g2479  |  349    23457  8    |
 +---------------------+--------------------+---------------------+

Loop inside a loop inside a chain:
(1=674)r457c9 - {(4)r23c9 = [(4)r1c78 - (4=75)r1c36 - (5)r6c3 = r6c5 - (5=246897)b8p235689 - (7=4)r1c6 - (4)r1c78 Loop] = (4)r23c9 Loop} - (4=671)r457c9 - (1)r6c7 = (1)r6c1 => -1r5c13 -1r6c7 -1r8c9 -4r1c278; ste :roll:

Thanks for the puzzle.
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