Crossword Genius

Written down at home by opponents playing chess? (2,5,3,5)

Ross

I believe the answer is:

in black and white

I'm a little stuck... Click here to teach me more about this clue!

'written down' is the definition.
(I've seen this in another clue)

'home by opponents playing chess?' is the wordplay.
I cannot quite understand how this works, but
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is found in the answer.
The remaining letters 'blackandwhite' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'at' is the link.

Can you help me to learn more?

(Other definitions for in black and white that I've seen before include "explicit" , "Most films are no longer" , "How extreme viewpoints are" , "committed to paper" , "fundamentalist way of viewing things?" .)

I've seen this clue in The Telegraph.
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