Reading trendline breaks before the mechanical signal

How the archive uses the three tools

A trendline is a straight line drawn across successive swing highs in a decline or swing lows in a rise so that a later close through that line can be treated as a change-of-condition signal. A breakout is a close that violates a previously drawn trendline and is used as the trigger to open or close a position. A stop-loss is a protective exit placed just beyond the last swing extreme so that a failed breakout cannot expand into an unbounded loss.

In the archive workflow, a downside trendline break can be treated as a long-entry hypothesis, with a stop-loss typically placed just under the prior swing low. The breakout is the trigger. The stop-loss keeps a failed break from becoming an unbounded loss.

When two uptrend lines are both valid

When an advance steepens, two valid uptrend lines can coexist. Applying the earlier construction rules keeps the trade on the slower of the two lines.

A break of that slower uptrend, and of a still-flatter companion line, can appear before a mechanical exit. In the archive workflow, that pair of breaks is read as evidence that the advance is ending.

Skip the spike when the next line starts

After a sharp one-bar drop at a peak, the subsequent downtrend line is started from a later bar than the extreme high rather than from that high bar itself. A large single-day low can be skipped when the next uptrend line is started, so the line originates one day after that low.

Later breaks on the same chart

On the same chart, a later downside-line break can reopen a long, and a subsequent upside-line break can close it at about the same time whether the steep or the longer uptrend is used.

When the hand-drawn break leads the system

A mechanical trendline-break simulator can print entries and exits that line up with hand-drawn breaks, including cases where the hand-drawn break leads the system by a few days. A chart check after a mechanical buy or sell can be used to skip setups that look like likely losers before an order is placed.

Editorial interpretation: the mechanical print is not the last word. The chart check is there so a setup that already looks like a likely loser is not turned into an order.