Candlestick formation · Bullish
What is it, in one line
Two green candles with a gap, then a red candle filling it.
Bullish · 3 candles · verdict: rule and thresholds below
Two green candles with a gap, then a red candle filling it. The engine checks the formation as an executable condition over open, high, low and close, with a trend filter applied before the count is kept.
Method
Three candles: two up candles with a gap between them, then a down candle that opens inside the second and closes inside the first — filling the gap exactly. Distinct from an upside tasuki gap, where the third candle stops short and the gap survives.
The traditional claim
Traditionally read as a continuation: the gap was filled and the uptrend is expected to resume regardless.
How this detection is wrong
Tasuki gap and gap three methods are the same three candles distinguished only by whether the gap survives. Comparing the two counts on the same data is a direct test of whether filling the gap matters at all.
Published so the count can be reproduced. Every figure below is a parameter of the rule, not a preference: change one and the occurrence count changes with it.
| Parameter | Meaning | Default |
|---|---|---|
| trendPeriod | bars of prior trend inspected | 5 |
| minPriorSlope | prior slope must be above | 1 |
| minGapAtr | gap between bars, at least, in ATR | 0 |
| minBodyAtr | body, at least, in ATR | 0.3 |
| atrPeriod | bars of ATR used to size everything below | 14 |
These share enough geometry that a detector can return more than one of them on the same bar. The engine reports every match rather than picking a winner.
Every pair on the site that can be mistaken for another, and what separates each: the look-alikes index.
Three candles: two up candles with a gap between them, then a down candle that opens inside the second and closes inside the first — filling the gap exactly. Distinct from an upside tasuki gap, where the third candle stops short and the gap survives. The detector also requires a prior uptrend, so the same shape in the wrong context is not counted.
It is read as bullish. Traditionally read as a continuation: the gap was filled and the uptrend is expected to resume regardless.
Tasuki gap and gap three methods are the same three candles distinguished only by whether the gap survives. Comparing the two counts on the same data is a direct test of whether filling the gap matters at all.
As an executable rule over open, high, low and close, with 5 named parameters — including bars of prior trend inspected 5, prior slope must be above 1, gap between bars, at least, in ATR 0 — all published on this page so the count can be reproduced. Strict and loose variants are defined as well, so the sensitivity of the count to those thresholds is visible rather than assumed.
Measurement pending re-run
No hit rate is published here yet. The run that would supply one was computed on engine ca6d9e36c81c; the engine is now cfb08765de7c. Its candlestick rows included the still-forming bar, and it predates the chart formations entirely, so those figures have been withdrawn rather than published with a caveat. The definition above is unaffected: it is what the detector tests, and no re-run changes it.