The entire thread is the answer (seriously). Basically if a SNB upheaval category event occurs, you will not get the stop price you wanted. Understanding the why is more important than just answering the question.
Hi Godzilla,
its a metter of win/Loss % ratio, one of the most importat metric to evaue a strategy.
So read your storic result and evaluate this ratio.
if your win/loss ratio is high yo can take more wide stop loss.
Remember, Stops hurt.
i wrote an article on this topic which might be interesting to you: NFX forex forecasts