# Dead tape — lesson

Gym heading: Knowing when not to trade. 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; today's bars come from point-at-the-bar's generator v2 (rotation / leg / mixed), by way of points-are-not-risk.

Choices made where the order was silent:

- **M is the gym's M:** the median high-to-low range of the last 20 bars of today's chart, in points. A prior session's M is the same statistic on that session, on the same bar interval. The strip is the 20 sessions before today, oldest on the left, yesterday at the right end. "Frozen" means a snapshot: the strip doesn't move while the rep is on the screen, and each rep is its own day with its own 20 sessions.
- **The percentile is a count.** Today's percentile is the share of the 20 prior sessions whose M is smaller than today's. Under the 20th percentile means fewer than four of the twenty were quieter; over the 80th means fewer than four were faster. The 20th-percentile M the reveal states is the fourth-smallest of the twenty and the 80th is the fourth-largest, so under and over read the same by count or by threshold. Ms are compared at one decimal of a point, the precision the reveal shows; the generator never builds a tie at that precision, and the harness counts any it serves (target zero).
- **The strip is drawn at the chart's scale.** A bar on the strip is exactly as tall as a candle of that range would be on today's chart, so the read is height against height. Nothing on the screen says what M is in points. The strip has headroom above the chart's top; a prior session's M taller than that is drawn to the top of the frame with a cap mark (the harness reports how often, per case).
- **Today's bars come from generator v2**, the regime (rotation / leg / mixed at the family shares) and the mirroring drawn once per rep and kept across rebuilds, so neither can carry the case. The day is built as the shown bars plus the next 20 and frozen at the shown count; the last 20 are the reveal. The chart is scaled to today's M in points only after the case has placed that M against the history, so nothing about the bars depends on the case.
- **The 20-session history is a clustered series** drawn with no knowledge of the case: each session's log M pulls toward the family's level with a shock. Today's M is then placed by the case at a family ratio: under the fourth-smallest, over the fourth-largest, or between. A config share of reps sits within a few percent of a line on purpose; the reveal shows the numbers either way.
- **Three cases a third each** (config).
- **The next 20 bars continue today's tape at today's vol** (the range process carries on). The reveal says what they spanned in today's M and in the median M of the 20 prior sessions, and nothing about how often anything happens. No percentages are shown anywhere.
- **Soft clock 8 seconds:** one comparison, made twice: the strip bars shorter than a normal bar today, then the taller ones.

Persistent header: **"Training your eye for the day that isn't a trade, and the day that needs a bigger ruler."**

## Before you trade today

- **The vol state** — M today against M over the last 20 sessions is the vol state. Under the 20th percentile the tape is dead: bars are small, every level gets run by noise, and a normal stop is inside the noise. Over the 80th it's hot: stops and targets built for a normal day are too tight. Between is normal.
- **M** — The median high-to-low range of the last 20 bars, in points. Today's M is not printed on the rep; today's bars are, and the strip beside them is drawn at the same scale.
- **The strip** — The last 20 sessions, one bar each, the height of the bar that session's M, oldest on the left, yesterday at the right end. A bar on the strip is as tall as a candle of that range would be on today's chart.
- **The percentile** — Where today's M sits among those twenty. Under the 20th percentile: fewer than four of the twenty sessions were quieter than today. Over the 80th: fewer than four were faster. The 20th-percentile M is the fourth-smallest of the twenty; the 80th is the fourth-largest.
- **The rule** — **Dead** when today's M is under the 20th-percentile M: fewer than four sessions were quieter. **Hot** when it is over the 80th: fewer than four were faster. **Normal** otherwise. Compared at one decimal of a point.
- **Why it matters at the trade** — Decision: dead tape means no trade, not a smaller trade. Hot tape means everything in M still works but the day range room is bigger. The panel's "vol state" line is this rule.
- **What it doesn't say** — The vol state is not a direction and not a setup. Normal says the rules work at face value; it doesn't say there is a trade. Hot says the ruler is bigger; it doesn't say which way. Whether a stop clears the swing is Stop vs noise; whether a target has room is Runway.
- **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

One comparison, made twice. Find a normal bar today: the middle of the pack, not the biggest and not the smallest. Count the strip bars shorter than it. Fewer than four: dead. Then count the strip bars taller than it. Fewer than four: hot. Otherwise normal.

## The rep

Today's 30 bars beside a strip of the 20 prior sessions' M as small bars, frozen. Today's M is not printed. The question, in full: **"Today's bars against the last 20 sessions. Dead, normal, or hot?"** Dead, Normal, or Hot, with a confidence.

## The reveal

The banner, the answer, today's M and the 20th- and 80th-percentile M stated in points, and one takeaway line. Templates:

- Dead: **"M is {N} pts, under the 20th percentile. Every stop is noise. Nothing here is a trade."**
- Normal: **"M is {N} pts, mid-range. The rules work at face value."**
- Hot: **"M is {N} pts, over the 80th. The ruler is bigger; so is the room and so is the risk. Everything still in M."**

Every rep ends on one of these three lines. Each is a decision: no trade, the rules at face value, or the rules in a bigger M. Then the next 20 bars, at today's vol, with what they spanned in today's M and in the median M of the last 20 sessions. No percentages are shown anywhere.

## Answer key

`smaller = the number of the 20 prior sessions whose M is below today's; larger = the number whose M is above today's. dead = smaller < 4; hot = larger < 4, checked after dead; normal otherwise.` Ms at one decimal of a point. Equivalently: today's M under the fourth-smallest of the twenty is dead, over the fourth-largest is hot. The three cases come up a third each (config). Some reps sit within a few percent of a line on purpose; the reveal shows the numbers either way. Nothing but the two heights carries the case: not the regime, not the mirroring, not the span of the day, not the shape of the strip.