Trendline breaks, right shoulders, and trailing stops

Study a breakdown in three checks

Editorial framing: this article treats a breakdown as three checkpoints in order. First confirm that the prior advance can be drawn as one rising line. Then test whether that line has truly failed. Only then ask whether the first bounce has failed again as a right shoulder.

In the archive workflow, a breakdown is a swift selloff that is studied after a stock has already had a significant advance over the prior few months. The preferred chart condition is an uptrend that has just broken its rising trendline.

Confirm one rising line

A well-defined uptrend is described as a straight-line series of lows with stairstep advances, so a later trendline break stands out clearly. The trendline is the straight line under successive higher lows.

When an automatically fitted trendline is shown, a numeric trend-quality reading appears on the chart. A lower reading is described as a better-defined trend. Trend-quality is how tightly an advance has respected its rising line; a lower compactness reading is described as a cleaner trend.

Test whether the line has failed

A clear move through the trendline is treated as the first invalidation of the advance. A straight breakdown is defined as a move from a new high directly through the trendline.

A shallow dip just under a trendline after a new high is treated as incomplete. Price may still rally, form a right shoulder, and only later break more convincingly.

One stated scan rule looks for trendline violations greater than 1.6 percent. Scans limited to names with a prior multi-month runup can produce signal-free stretches of two or more weeks during general market advances.

Ask whether the bounce failed as a right shoulder

A head-and-shoulders breakdown is defined as a sharp drop from a new high, a several-day sideways or upward recovery that forms a right shoulder, then a renewed decline through the trendline. The right shoulder is the short pause or bounce after the first drop from a high, before price falls again.

The same scan rule can also flag a sharp selloff, a brief recovery, and a second decline. In this usage, head-and-shoulders is a selloff structure in which a drop from a peak is followed by a brief sideways or upward recovery that forms a right shoulder, then a second decline that leaves the prior uptrend.

Keep the last check falsifiable

A trailing stop is described as being applied from the start of the position so an early move with the idea is not fully reversed and a move against the idea can be closed promptly. The stop is set at the start of the idea and then advanced if price moves with the thesis, so a failed breakdown can be dropped quickly and an early gain is not fully given back.

Editorial note: treating the trailing stop as the classroom device that keeps the third checkpoint falsifiable, instead of turning the chart into a debate, is a TradersWeek interpretation. It is not an archive ranking of the three checks.