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    @fstnando77

    From Kata description:

    Sometimes a line may be valid in one direction but not the other. Such a line is still considered valid.

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    I agree with amitznati. In the following case (Good5):

       +-------+          
   |      +++---+     
X--+      +-+   X 

    You are also not 100% sure which path to take, however return true.

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    clean af! gg

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    Did you read the hint in the Kata description?

    Imagine yourself walking a path where you can only see your very next step. Can you know which step you must take, or not?

    If you are not 100% sure which step you must take then line is not valid.

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    This comment is hidden because it contains spoiler information about the solution

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    Sorry, I didn't understood what it mean ambiguity in terms of paths, maybe its lingo diffs...

    you will get to a junction. Do you turn left or right? You don't know...
    What does it mean?

    If I can go left (didn't stepped on this cell before) I'll try to go left, same for right...

    can you please clarify this condition?:
    "It must be possible to follow the line with no ambiguity"

    Seems like I'm not the only1 struggling with this condition..

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    It must be possible to follow the line with no ambiguity

    • e.g. When starting from bottom-right X you will get to a junction. Do you turn left or right? You don't know...
    • e.g. Similar can happen when starting at the left-side X

    Since the line is not "valid" in either direction then it is not considered a valid line.

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    I read the discussions, and I still don't get why it's invalid test:

        +-+
    | |
    ++++
    ++++
   X+++
     +---X

    there is only one path forward and backward, isn't it?

    is it possible to pass on corner twice but to different directions?