implBlog2.rs

use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize)]
pub enum PlayerSide { /* ... */ }
#[derive(Serialize, Deserialize)]
pub struct Move { /* ... */ }
#[derive(Serialize, Deserialize)]
pub struct Board { /* ... */ }
#[derive(Serialize, Deserialize)]
pub struct Chess { board: Board, turn: PlayerSide }

impl Chess {
    pub fn apply_move(&mut self, player_move: &PlayerMove) -> bool;
    pub fn starting_state() -> Self;
    pub fn list_valid_moves(&self) -> &[PlayerMove];
}

// usage
let moves_data: String = read_input("input.txt")?;
let player_moves: Moves[] = serde_json::from_str(&moves_data)?;

let mut chess_game = Chess::starting_state();

display(&chess_game);

for player_move in &player_moves {
    chess_game.apply_move(player_move);
    display(&chess_game);
}