function sync_board(){
    let table = {1:'K', 2:'Q', 3:'R', 4:'B', 5:'N', 6:'p'}

    for(let i = 0; i < 8; i++){
        for(let j = 0; j < 8; j++){
            if(board[i][j] == 0) continue;

            let square = document.getElementById(`${alphabet.charAt(j)}${8 - i}`)
            let piece = document.createElement('p')

            piece.classList.add(board[i][j] > 0 ? 'w' : 'b')
            square.append(piece);
            piece.append(table[Math.abs(board[i][j])])
        }
    }
}