Yeah nothing is hundred percent sure in the forex market, risk management is good, it helps you to know what you'll be risking and what you'll get in return, that's what we call risk to reward, but for that of Wednesday is different, the brokers know what they do, I know you must know what stop loss is? That Friday,even if you place an order with stop loss it won't activate, it will just go ahead and clear the whole thing, and if you don't have a good margin it will just blow your account, that's how traders suffered this Wednesday. That's very bad.