При чтении значения с помощью цикла for возникает эта ошибка (ValueError: недопустимый литерал для int() с основанием 10: '')

Я пытаюсь создать шахматную игру, которую можно запустить на терминале, а переменная, которая должна иметь значение, не имеет значения, и я не знаю, в чем проблема

Я хочу создать шахматный движок, но перед тем, как сделать шахматный движок, я пытался создать шахматную игру, которую можно увидеть на терминале, и если вы хотите, вы можете сыграть в шахматную партию и управлять доской из терминала. Я пытался сделать так, чтобы переменная colomn_m считывала последнюю цифру шахматного хода для столбца фигуры с помощью цикла for, и я исключал ее, чтобы иметь значение, но этого не произошло

этот code | |/

пожалуйста, помогите мне

board = [[" R ", " N ", " B ", " Q ", " K ", " B ", " N ", " R "],
         [" P ", " P ", " P ", " P ", " P ", " P ", " P ", " P "],
         ["   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "],
         ["   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "],
         ["   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "],
         ["   ", "   ", "   ", "   ", "   ", "   ", "   ", "   "],
         [" p ", " p ", " p ", " p ", " p ", " p ", " p ", " p "],
         [" r ", " n ", " b ", " q ", " k ", " b ", " n ", " r "],]


m_c = 0

piece_m = ""
row_m = ""
colomn_m = ""

def draw_b():
    print(" +---+---+---+---+---+---+---+---+")
    print("8|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[7][0], board[7][1], board[7][2], board[7][3], board[7][4], board[7][5], board[7][6], board[7][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("7|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[6][0], board[6][1], board[6][2], board[6][3], board[6][4], board[6][5], board[6][6], board[6][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("6|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[5][0], board[5][1], board[5][2], board[5][3], board[5][4], board[5][5], board[5][6], board[5][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("5|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[4][0], board[4][1], board[4][2], board[4][3], board[4][4], board[4][5], board[4][6], board[4][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("4|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[3][0], board[3][1], board[3][2], board[3][3], board[3][4], board[3][5], board[3][6], board[3][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("3|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[2][0], board[2][1], board[2][2], board[2][3], board[2][4], board[2][5], board[2][6], board[2][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("2|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[1][0], board[1][1], board[1][2], board[1][3], board[1][4], board[1][5], board[1][6], board[1][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("1|{}|{}|{}|{}|{}|{}|{}|{}|".format(board[0][0], board[0][1], board[0][2], board[0][3], board[0][4], board[0][5], board[0][6], board[0][7]))
    print(" +---+---+---+---+---+---+---+---+")#emptyrom*********************************************************************************************
    print("   a   b   c   d   e   f   g   h  ")#emptyrom*********************************************************************************************

while True:
    draw_b()

    try:
        move = input("Enter your move: ")
    except ValueError:
        move = input("Please enter a correct move 'xxx piece_letter+the_colom+the_row': ")

    m_c = 0
    
    for i in move:
        if m_c == 0:
            piece_m = i
            m_c =1
            continue
            
        if m_c == 1:
            match i:
                case "a":
                    row_m = "1"
                    print("1")
                    continue
                case "b":
                    row_m = "2"
                    print("2")
                    continue
                case "c":
                    row_m = "3"
                    print("3")
                    continue
                case "d":
                    row_m = "4"
                    print("4")
                    continue
                case "e":
                    row_m = "5"
                    print("5")
                    continue
                case "f":
                    row_m = "6"
                    print("6")
                    continue
                case "g":
                    row_m = "7"
                    print("7")
                    continue
                case "h":
                    row_m = "8"
                    print("8")
                    continue
            m_c = 2
            continue

        if m_c == 2:
            colomn_m = str(i)
            print(colomn_m)
            m_c = 3
            continue

    m_c = 0

    print(piece_m)
    print(row_m)
    print(colomn_m)

    board[int(row_m)-1][int(colomn_m)-1] = f" {piece_m} "