Examples of Simple Forex Trading Systems. Corvin Codirla, ex-hedge fund manager and trader comments. Could you give examples of simple forex trading systems that work? PLEASE SUPPORT US. LIKE THIS VIDEO IF YOU FOUND IT USEFUL. A simple one would be looking at weekend gaps. We previously said that currencies tend to mean reversion during the weekend meaning that if they gap a significant amount, then that gap tends to close. Other kinds of strategies would be momenum-driven currencies.