Dear Mr Tanaka, is it possible to open both buy and sell at the same time. So that when the first buy and sell is opened, let say the trade martingale goes for a sell. Then at the same time all the buys will open. So when it is time to close all the sells because basket profit has been reached, then that is the time to close all the buys in profit.
Yes, it is difficult and I try to opposite close , but it is not profitable. If price move out of the band, still price move up and up..... In this case you need martingale.
