@fstnando77

From Kata description:

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

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

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

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

clean af! gg

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.

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..

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.

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?