I do not think there is a strategy the profit 100%
But there are strategies where the profit and loss a lot a few
For example, Sitka Russian strategy
Place orders pending the sale and purchase at Stop 00 and 50

Prior to these levels with 10 points puts the sale and purchase orders to die hanging even if we reverse

Price Hedge works 10 points and taking the profit will be at a level of 00 and 50

Without a stop loss strategy depends on the volatility of that is excellent in the GBP USD