How do you refer to White and Black in English?

As a foreigner I'd like to ask which word has to be used

a) He?

b) It?

c) They?

Not sure I understand the question perfectly

I would say

they are both colors

it is a color(if referring to only one of them)

Hee.

As in "tee hee, I just checkmated you".

it (b) for one ... they (c) for both

Suffragettes are hot.

Pretty much every chess book I own uses "he," except for the ones that go to great pains to always say "white" or "black," presumably because they didn't want to deal with this very question.

An article in Chess Life written by Elizabeth Vicary about a game between two women even used the "he".

I'm asking because Dzindzi in his videos , like the last one for example, talks like this: "There's no way Black can resist here, so they resigned" :)

Besides since White and Black are abstract names, shouldn't be proper to use the pronoun "it"?

I mean ... grammatically proper

"His or her" gets pretty tiresome in many situations, and there have been several attempts to have a standard word instead. My favourite is "hes" (rhymes with fez)...obviously it didn't catch on though.

Instead we often use "their", which sounds clunky in many contexts, such as in chess, where it sounds like you're referring to both players.  

The pronoun he is generic and includes both male and female.  

You are a sexist.  Using the generic assumes that the position is the same for the whole human race and that gender is irrelevant.  You insistence that the gender of the player is relevant is based on pure prejudice. 

Perhaps over a 1000 years ago the English language developed as it did for partly sexist reasons, but I don't see that as a reason to stand the English language on it's head and resort to awkward constructions.  We might just as well abandon the whole language since it was developed by a bunch of barbarians.