Tried it. Typed e4. Got this:

    Traceback (most recent call last):
      File "sunfish.py", line 388, in <module>
        main()
      File "sunfish.py", line 365, in main
        move = parse(crdn[0:2]), parse(crdn[2:4])
      File "sunfish.py", line 345, in parse
        fil, rank = ord(c[0]) - ord('a'), int(c[1]) - 1
    IndexError: string index out of range