Logic Masters Deutschland e.V.

Krop Circles

(Published on 26. April 2022, 00:00 by SirSchmoopy)

This is another one of the puzzles I've been working on featuring this variant of cycles. I believe this should be much more approachable to people that haven't tried one of my earlier puzzles using this variant, as the Kropki dots are fairly powerful on their own.

Links:

F-puzzles
CTC (with solution check)

Rules:

Normal Sudoku rules apply.
Cells separated by a white dot are consecutive. Cells separated by a black dot have a ratio of 1:2. Not all dots are necessarily given.

Let a cycle be the path created along a row in the grid by starting with the cell in column X with a digit A, then going to column A with a digit of B, then going to column B with a digit C, etc. until arriving at a column with digit X which goes back to where you started.

Let the order of a cycle be the number of unique digits in a cycle.

e.g. If in a single row, column 1 contained a 5, column 5 contained a 9, and column 9 contained a 1, this would form a cycle with an order of 3.

In addition to normal Kropki rules, orders of the cycles of cells separated by a white dot differs by one, and orders of cycles of cells separated by black dots have a ratio of 1:2

Additional notes:

Whereas by Sudoku rules, digits along the same row/column can't repeat, this is not true of cycles. So while 3 cells in a row connected by black dots would need to have digits of 1,2,4 or 2,4,8, the orders of the cycles cycles could be 1,2,4, or 1,2,1, or 4,2,4, or 3,6,3 etc.

It is similarly possible for the cycles to overlap within a chain of cells connected by dots. For instance, if a single row had a chain of 3 cells connected by black dots with cycles of 2,4,2, then there could be a single order 2 cycle which contained both outside cells with an order 4 cycle containing the cell in the middle.

Solution code: row 8 + row 9 (18 digits, no spaces)

Last changed on on 16. May 2022, 23:09

Solved by Dingasm, Dag H, tlepetit, CookieWookie, IAM3, Arlo Lipof, PippoForte, Felis_Timon, Lorff, cha, starwarigami, tuturitu, DiMono, SamuPiano
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Comments

on 16. May 2022, 23:09 by SirSchmoopy
clarifying rules that there is no negative constraint

Last changed on 30. April 2022, 11:15

on 30. April 2022, 11:13 by Lorff
It took me a while to get the point of the cycles without the boxes I've seen in other cycle puzzles -every cell in every row is part of a cycle this time- but once I got it this turned into one of the nicest puzzles I've solved. Loved it.

on 26. April 2022, 22:51 by Arlo Lipof
The cycle logic as a meta-Kropki constraint is mind-blowing! Thank you!

Difficulty:3
Rating:N/A
Solved:14 times
Observed:7 times
ID:0009QQ

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Solution code:

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