I'm convinced there's an obvious response. Let's say EUR/USD, what monies are affected by, for instance, if you are trading.
Is it feasible to forecast the moves of other monies based on a single currency pair's price actions. Certainly if the dollar strengthens against the Euro then it strengthens against other currencies too? If the risk of one allows is this a workable way to exchange whenever is a strong trend in play as on Friday using the EUR/USD?