Why?

Which is?

'I assume you mean that this should test whether a board can be valid'

Yes, that is what you're supposed to do.

There is, but you have to go to the main page of the kata and scroll down ;-)

Good to know, I wish katas and solutions had a date in the description, so new users (like me) can get some sort of perspective on them :P

It's already raised as an issue many years ago ;-)

Huh, this kata needs some randomized test xD Clever thinking though.

Can you explain your logic?

Agreed. Should be 4kyu.

Thanks!

nah, don't change '+++,' to ','.

I'm happy to hear that (even though my loop handling is not the best...)

Wow, so clean...
Beautiful