Given that this kind of strategy will work best with minimal spread and fast execution, I advise working with an good ECN broker. Crucial File  ????????? ???????? ?????? ?????? ?? ???????? ?????. ????????? ??????? ?????? ????????? ? ???? ?????. ? ?????? ????? ???????? ??????????. ???? ?????? ??????? ? ??????????? ?????? ? ??????????? ?????????, ??