Not really a suggestion pertaining to this kata, but may be worth making as another kata instead.

This really isn't a problem.
You are making 'i' an int, and the result of sizeof(strings)/sizeof(char*) is an unsigned long
The compiler is just telling you that an int and unsigned long are not identical data types, and to be careful comparing them.

Fixed.

Fixed in this fork: https://www.codewars.com/kumite/628a6f42443a3a0027214190?sel=628a6f42443a3a0027214190

changed to 'maze'

there's no problem with the .map method which is tied to the Array namespace; i guess the ambiguity is with Map

The first 1 of the answer should also give a white for any of the 1s in guess.

the second one is the reversed relation (sort of): 1,3 <-> 3,1 => 2 whites

Why?

You have dating anniversaries too- though it is a bit odd that it's his anniversary and not yours.

Interesting, may I know how?

thx you example helped me to understand the kata!

Sorry for that.
I enhanced tests now with more detailed error messages.

Thanks for the feedback.