Did you know that there is the strategy for trading currencies that is theoretically risk-free? This strategy is called Triangular Arbitrage and it is well described in "Triangular arbitrage as an interaction among foreign exchange rates" by Yukihiro Aibaa, Naomichi Hatanoa, Hideki Takayasub, Kouhei Marumoc, Tokiko Shimizu. The idea is quite the simple: you have account in US dollars - you see the profit opportunity for the following exchange (for example of cource) - convert Dollar to Euro, convert Euro to Yen, then convert back Yen to Dollar. All these conversions are made simultaneously and You get more Dollars at your account.
Is not it bad for RISK FREE FOREX TRADING SYSTEM???
(to be continued)