Here is a little toy for you guys.

the strategy is simple, using a simple EMA 200 :
when ma[0] < ma[1] = BUY
when ma[0] > ma[1] = SELL

so it's some kind of contrarian strategy, where we buy when MA goes DOWN and we sell when MA goes UP

as you can test yourself it's profitable on every pair except AUDNZD and GBPCAD !
and some pairs have a very high return (with 2K pips sometimes of 2 years = 10K bars)

MA200 is powerful! Of course this is not a strategy on its own, but it can be a base for your strategy

also drawdown is very high on some pairs, so this is to consider

Jeff