A pretty neat implementation of Renegade/Reversi/Turncoat/Othello™
Not a game I play often, so it took a couple games to get my brain in gear. However I was able to defeat the unnamed robot!
Showing where pieces can be placed is a neat touch that humans will appreciate!
Othello for the GameBoy released in 1990 and did not offer such hints
A traditionalist might want to turn off those hints, and may prefer a board which is a plain grid (although I prefer the way you've done it)