Logic Masters Deutschland e.V.


(Eingestellt am 5. September 2022, 15:46 Uhr von stephane.bura)

Place the digits 1 to 8 in each row and each column.

Each horizontal and contiguous pair of cells that is fully comprised in the first 7 columns forms the coordinates of a digit in the grid:

  • The leftmost member of the pair is its row.
  • The rightmost member of the pair is its column.
  • Its value is the row in which the pair is.

For instance, if R4C1 contains 7 and R4C2 contains 5 then R7C5 contains 4.


Play this puzzle online

Bonus puzzle: you can apply the same logic with a 9x9 grid using pairs in the first 8 columns and with a 1 in R9C5.


Lösungscode: Column 2, column 7

Zuletzt geändert am 6. September 2022, 12:09 Uhr

Gelöst von udukos, Piatato, Phistomefel, Aaronomys, polar, Omogram, SSG, Silverstep, zeneszerzo, KNT, thoughtbyte, ymhsbmbesitwf, FmrSudokuPhilosopher, OGRussHood, jkuo7, Huuda, 0ctahedron, fserb, Vivian Huang, ... WallE-93, pianobarry87, zefyr0s, admirableostrich, Harzarry, djarl, Uhtoff, michelkraemer, cdwg2000, Pater, Ceedrich, SherlockSage, geronimo92, BrainierBunny, antiknight, Jordan Timm, coldfrog
Komplette Liste


am 25. September 2022, 22:26 Uhr von antiknight
A mad puzzle ! Thanks for sharing ^^

am 24. September 2022, 09:08 Uhr von stephane.bura
Many thanks to all the solvers for this incredible feedback :)

am 24. September 2022, 09:07 Uhr von stephane.bura
@Andrewsarchus Perseverance :)
I toyed with self-reference in other puzzles (0003EC, 0003EM, 0008NI, 0009TY) and wanted to find a ruleset and a grid that pushed this idea as far as I could push it. This was a happy discovery.

am 23. September 2022, 12:08 Uhr von Andrewsarchus
How did you find this? Incredible!

am 23. September 2022, 06:43 Uhr von fserb
this was amazing.

am 23. September 2022, 02:33 Uhr von OGRussHood
This puzzle is mad.

am 23. September 2022, 02:10 Uhr von FmrSudokuPhilosopher
Very cool philosophy of regionless sudoku.
(I think it's easier than it seems at first glance, definitely worth trying, and the absence of regions makes cheating impossible)

am 23. September 2022, 01:07 Uhr von thoughtbyte
That was a mind bender! I figured I'd give it a few minutes of thought before watching the CTC showcase and I'm glad I did. Very proud of that solve. Beautiful idea!

am 23. September 2022, 00:30 Uhr von stephane.bura
@zeneszerzo and @KNT Thanks!
I'm beaming :)

am 23. September 2022, 00:23 Uhr von KNT
wow! I've been aware of this puzzle and have avoided it out of fear since it was published, but (maybe embarrassingly?) the CTC feature gave me the push to try this. One of the most awesome eureka moments ever and a smooth clean up after the a-ha. magnifique

am 23. September 2022, 00:21 Uhr von zeneszerzo
What an invention!

am 15. September 2022, 18:43 Uhr von stephane.bura
@polar I'm glad you liked it :)

am 15. September 2022, 18:38 Uhr von polar
I can't say this looked like my cup of tea originally, but then I read the comments below and thought I'd give it a go.. And goodness I'm glad I did! Rarely do I get such an a-ha moment solving puzzles (they are always my fave moments too!), but when the penny dropped, it was just splendid. Thank you so much :)

am 14. September 2022, 23:28 Uhr von stephane.bura
@Phistomefel Thanks :)

am 14. September 2022, 18:12 Uhr von Phistomefel
Amazing puzzle! At first it seems impossible to fathom what is going on, but I got there eventually. Beautiful! Thank you so much for setting this gem, Stephane!

Zuletzt geändert am 9. September 2022, 12:13 Uhr

am 9. September 2022, 12:11 Uhr von Piatato
Stunning puzzle! It gave me a great eureka feeling when I understood what was going on. I hope more people will sit down and enjoy this treat. :-)

That's the feeling I was shooting for. Glad you liked it.
Thanks :)

am 9. September 2022, 09:33 Uhr von stephane.bura
Thanks udukos :)

Zuletzt geändert am 9. September 2022, 00:18 Uhr

am 9. September 2022, 00:18 Uhr von udukos
Wow! Great puzzle! This is like the boss of numbered rooms. How do you even come up with such an idea. Glad to have you back creating puzzles. :)

am 6. September 2022, 12:09 Uhr von stephane.bura
Bonus puzzle

am 5. September 2022, 20:34 Uhr von stephane.bura
Note: There is a narrow logical path.
The break-in requires you to thoroughly understand the consequences of the ruleset.

am 5. September 2022, 16:47 Uhr von stephane.bura
Added tags

Zuletzt geändert am 5. September 2022, 16:48 Uhr

am 5. September 2022, 16:42 Uhr von CHalb
So you might set the label "Latin Square" instead.
Okay, I added the tag so we're both right ;)

am 5. September 2022, 16:37 Uhr von stephane.bura
@CHalb Well, it is a Sudoku without regions.
Bookmark it ;)

am 5. September 2022, 16:33 Uhr von CHalb
Wow, this looks fascinating! Please remove the Sudoku tag, so I might find it again not just by chance ;-) .

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