I apologise if this is covered elsewhere, I have tried searching.
Today I placed a long spread bet on the Dow at 23,434 and set a generous 200 point (actually 209) stop loss at 23,225. The trade at one time was up 75 but from there it ran down close to the stop loss. By chance, the lowest point according to the chart was 23,226 but the stop loss was triggered and I suffered a 209 point loss. Since then the market has recovered and I would now be about 200 points ahead. I appreciate the market is choppy at the moment but when is a stop a stop? Might it have been triggered at 23,227 or 23,230?
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