Thursday, 3 November 2011

Puzzle #49: Slitherlink; Liars

I'm not sure how much I will post in the next week or so. I will be flying out to Hungary on Sunday to participate in the World Sudoku Championships and World Puzzle Championships.

For this puzzle, the opening is trickier than my previous Liar Slitherlink puzzle.

Rules for Slitherlink

As an additional rule, exactly one clue in every row and column is incorrect.


  1. Took me a couple days and a couple lurches, but I solved it. (After you find the four problem areas in C3-6, prove that R7C3 isn't lying.)
    So, how's Puzzle 50 coming along? Is it going to be a doozy?

  2. Solved this one now when revisiting it. Nice one. Towards the end, I liked how the "negative" logic made the solution unique.

  3. Hi.

    I've found the four problems in C3-6 as cyrebjr explained, but I can't manage to prove that R7C3 is true.
    Can you give me a little hint ?

    Thanks anyway !

    1. Power of posting !
      Found an incoherence between the diagonal 3s pattern and the right 0 on row 7.