# Runway — lesson

QA revision September 14, 2026: visible context, measurement access, and wording; see docs/exercise-qa-fixes-2026-09-14.md.

Gym heading: Sizing the order. Written before the code (Sep 7 2026). The teach screen shows this text; the answer key implements the rule in it and nothing else. Distances are in M everywhere. Harness, confidence, persistence, and reveal format follow stop-vs-noise.

Persistent header: **"Training your eye for the room between the entry and the next thing heavy."**

## Before you aim

- **Room** — how far price can go from the entry before it hits something heavy, measured in M. It is measured, not felt: the distance from the entry to the next obstacle in the trade's direction. Nothing about the direction has to be true for the number to be right.
- **The level map** — The grey lines are given reference levels for this exercise; their formation is not shown. Use only this supplied map to assess room. This task does not ask you to discover levels or establish that they will hold. The nearest supplied level on the target's side of the entry is the next obstacle.
- **The target** — a distance from the entry, measured in M. Points mean nothing: 20 points is a fifth of the room one night and twice the room the next.
- **The rule** — a target has runway when it sits **inside the first half of the room**: its distance from the entry is at most **f × the distance to the next obstacle**, with f = 0.5. A target past the obstacle has no runway at all: something is between here and there. A target in the far half needs the full fill, and the crowd in front of the level gets paid before you do.
- **Why it matters at the trade** — the room is a veto, never a target-setter. It says when a target is too far; it never says where to put one. A stop that survives the noise and a target with no runway is a trade with a real exit against you and a wished-for exit in your favor. The trade doesn't exist at that target.
- **What it doesn't say** — runway is not a forecast. It says nothing about direction, nothing about whether the obstacle is a magnet or a wall (Magnet or wall, a different module), nothing about how fast the room gets crossed (Thick vs thin), and nothing about the stop (Stop vs noise).
- **M** — the median high-to-low range of the last 20 bars. Every distance here is in M. The number for the current chart is on the screen.
- **Confidence is a number** — Low means 40%, Medium 65%, High 90% that your call is right. Scored Brier-style: sure and wrong costs 0.81, unsure and wrong costs 0.16, sure and right costs 0.01. Being certain is as expensive as being wrong.

## The read

Two distances, both in M: from the entry to the next obstacle on the target's side (the room), and from the entry to the target. Then the question: is the target inside the first half of the room?

## The rep

The chart labels these as given levels, and the prompt explicitly limits the task to the supplied map.

A chart with a proposed entry at the last close, a target drawn on it, and the given level map. M is stated. The question, in full: **"Long (or short) from the last close, target at the green line. Using only the given level map, is the target within half the distance to the nearest level ahead?"** Yes or No, with a confidence.

## The reveal

The room in M and which level is the obstacle, half the room in M, the target's distance in M and where it sits, the verdict, and one takeaway line. Templates:

- Runway: **"{target} M target in {room} M of room — inside the first half; the room is there."**
- No runway, past the obstacle: **"{target} M target past the level at {room} M — something is between here and there."**
- No runway, far half: **"{target} M target in {room} M of room — the far half needs the full fill; the crowd in front of the level gets paid first."**

Every rep ends on one of these three lines. Each is a decision: this target stands as drawn, or it comes in, or the trade doesn't exist at that target.

## Answer key

`hasRunway = (targetDistance <= f × room)`, room = the distance from the entry to the nearest level on the target's side of the entry; f = 0.5. Levels behind the entry are ignored. About half the reps have runway (config). Some targets sit within a few percent of the halfway line, or just past the obstacle, on purpose; the reveal shows the numbers either way.