I only had an Idea, about a trading system, Simply plot an EMA 21 into a 30M GBP/USD Chart, and tell me what thoughts come to your head, Inside my head together with my expiriences, I see a profitable trading system, but that I would also like to know what is from another people heads (Not asking any advice, I am just curious about others imagination) and please explain what sort of oportunities and disavantages you see on that chart.

Thanks