Why entry scans fail without trend filters

When the scan list does not match the lesson

A candlestick pattern is a repeatable OHLC chart condition, such as three to five declining candles or lower highs. It is treated as a candidate signal rather than a standalone forecast.

A scan-plugin searches charts for a named pattern and returns a list of tickers. That software may or may not enforce the same conditions taught in the underlying method.

The pristine buy setup is a retracement-in-uptrend candidate defined as three to five red candles or lower highs inside a solid uptrend. Course criteria for that buy setup stated that stocks must be in a solid uptrend, but the matching plugin did not impose that requirement.

A named buy setup taught as a retracement in an uptrend can therefore be returned by a scan while the chart is in a downtrend if the software does not require trend direction.

Why the trend requirement was left out

The vendor replied that an initial slide description of the setup did not mention trend, even though later instructional material required an uptrend.

During plugin development, requiring trend direction produced too few tickers, so that filter was omitted from the scan design.

A three-black-crow style condition is uncommon relative to more frequent candlestick events, which is why a scan is often used to locate it.

The missing pieces of a complete entry rule

A rule-based entry is a written if-then procedure that states when to enter, when to exit, and when to stand aside, including any scan or size constraints.

Trend following, in this use, is a requirement that the candidate form with the prevailing directional bias so a pullback is not mistaken for a reversal.

Changing of the guard is a confirming candle condition that can add weight to a basic buy setup after the trend and retracement rules are already met.

Editorial: dropping a trend requirement to harvest more signals is a design choice that changes what the pattern actually means. A candlestick entry rule is not a complete system until the scan, the trend filter, and the exit logic are tested as one procedure.