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Flash crashes: what scalpers can learn from the worst moments

Flash crashes, such as sudden drops of hundreds of pips in minutes, expose weaknesses in every part of the setup. Stops fill far from their levels, spreads blow out, platforms freeze, and brokers may cancel trades.

They happen in thin conditions, often around rollover or after a surprise. The price recovers quickly, but those with stops hit may be left with large losses.

For scalpers, lessons include avoiding trading in thin windows, limiting leverage so that a gap does not wipe out the account, and understanding the broker's policy on trade cancellations. Some brokers cancel trades executed at off-market prices, which can help or hurt.

Keep the position size small enough that even a slip of 50 to 100 pips is survivable. Ensure server-side stops exist, and avoid relying solely on mental stops.

Review historical flash events on the pairs traded, and consider what would have happened to the strategy. Stress testing with such moves reveals hidden fragility.

How would the current system have fared in a major flash crash?

I was in a flash move on GBPUSD a few years ago, and what I remember is how little the chart looked like what the platform showed. My stop was at 25 pips and it filled about 90 pips away, and for a few seconds I could not even close the position because the prices were not updating. It was a 2 percent loss that could easily have been much worse had I used a larger size.

After that I changed three things. First, I stopped trading in the thirty minutes around rollover, when liquidity is thin. Second, I made sure each stop was a server order on the broker side, never in the EA's memory or in my head, because the platform can freeze when you need it. Third, I ran my current rules through the dates of the largest moves on the pairs I trade.

That last exercise was the most helpful. On two of the dates my system would have lost around eight percent, which was far above my comfort level, and I lowered my size by a third to bring it back in line.