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Failed BOS: what to do when the break reverses within three candles

Breaks of structure fail all the time. Price closes above the high, you buy, and two candles later it is back below and heading for your stop. Instead of treating that as bad luck, I treat it as information. A reversal within three candles after a break usually means the break was a sweep that looked like a close, or the move lacked displacement. I now check three things before entering a BOS: whether the candle that broke it was large relative to recent candles, whether it closed near its high rather than printing a long upper wick, and whether the next candle held above the broken level. If the next candle fails to hold, I do not enter or I exit early at a small loss. A failed BOS also gives a counter trade idea: the trapped buyers become fuel for a move in the opposite direction, but only after confirmation of a lower break. Do not flip on the first candle. Let the structure show you.

The three checks are useful because they're all visible at the moment you'd enter, so you're not relying on hindsight. I'd add a fourth: where is the break happening relative to the higher timeframe? A BOS that runs straight into an H1 or H4 level that hasn't been touched yet is more likely to stall and reverse than one with open space ahead. It doesn't mean skip it every time, but it's a reason to want a stronger break candle or a smaller size. Context on the bigger chart explains a lot of these fast failures once you start checking it.

On the counter trade idea, I'd be strict about where the stop goes. The trapped buyers story is nice, but the high they bought into is now a level that may get tested again before any real move down. If you short the failed break, the stop above that high has to be far enough to survive a retest, which often makes the R worse than it first looks. Sometimes the cleaner decision is just to stand aside, note the failure in the journal, and wait for a proper lower high to sell instead. Not every trap needs to be traded.