What it is
Mark the high and low of the first 15–30 minutes of the US cash session (9:30–10:00 ET). Trade the break of that range in the direction of the day's opening drive.
Why it works
The opening range absorbs overnight news and positioning. A clean break of it typically signals which side won.
Entry & stop
Enter on the close of the first candle outside the range. Stop = other side of the range. Target = range width × 1–2.
Filter
Skip on obvious FOMC / CPI mornings or when the range is unusually wide — the risk is not worth the R:R.
