Code shared from the Rust Playground

playground.rs

fn main() {

    #[derive(Clone, Copy, Debug, PartialEq)]
    enum Piece {
        Pawn(Color),
        Rook(Color),
        Knight(Color),
        Queen(Color),
        King(Color),
        Bishop(Color),
    }
    
    #[derive(Debug, Clone, Copy, PartialEq)]
    enum Color {
        White,
        Black,
    }
    
    let mut chessboard: [Option<Piece>; 64] = [None; 64];
    for i in 0..64 {
        let (row, col) = (i%8, i/8);
        chessboard[i] =  match (row, col) {
            (_, 2) => Some(Piece::Pawn(Color::Black)),
            (_, 6) => Some(Piece::Pawn(Color::White)),
            _ => None,
        }
    }
    
}