Can you read a trend day from a range day — on the open?

We tested this on 4,409 real days. The honest answer: the open tilts the odds, it doesn't decide them. The strongest signals are range expansion (first-hour range vs its 20-day average) and whether price broke and held the first-hour range. Your job here isn't to be right every time — it's to read the tilt correctly and size your exit to it.

The rule you're training: big expansion + a held breakout → lean TREND, hold winners longer. A contained first hour that won't break out → lean RANGE, take profit early. Even a perfect read is wrong ~half the time — that's why you manage risk, not predict.

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