def tie_checker(currBoard):
    """
    Takes in the current board and checks if there's a tie. To check for a tie,
    the script searches for whether or not the board is filled. Returns true
    if the board is filled and false if not.
    """
    
    # Finds how many squares are filled in
    filledInCount = 0
    for pos in currBoard:
        if (pos != "  "):
            filledInCount += 1
            
    # Checks if all the squares are filled (if there's a tie)
    if (filledInCount == 9):
        return True
    else:
        return False