The word "cheat" was a bad choice I realize. I meant shade, or edge, or somewhat overweight your market making book in the direction you think the market is going. To "cheat" in a direction is a common nautical term from my previous life (cheat the left side of the channel) and I sometimes slip it out without thinking about the context, my bad!
Market participants might be absolutely different people, and this is one of the forex's advantages. Anyone can achieve success on this market, if he or she makes enough effort.
There are various participants in the forex market like commercial banks, central banks, retail traders and non banking corporations.