Stop first, size second
Position size
BUY (long)
Amount at risk—
Distance to stop—
Position size—
Quantity (units)—
Implied leverage—
R:R ratio—
Potential gain—

The right logic: the stop goes where your thesis is invalidated, and it's the size that adjusts to the accepted risk — never the other way round. An R:R below 2 is worth skipping.

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