Candlestick formation · Bullish
What is it, in one line
Two adjacent candles sharing the same low.
Bullish · 2 candles · verdict: rule and thresholds below
Two adjacent candles sharing the same low. 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
Two consecutive candles whose lows sit within a small tolerance of each other, following a decline. The tolerance is expressed in ATR units rather than price, so the same definition works on any instrument.
The traditional claim
Traditionally read as a support level being tested twice and holding.
How this detection is wrong
Not a TA-Lib formation, and “the same low” is never exactly the same on real data — which is why the tolerance is an explicit parameter rather than an equality test. Set it too wide and every pair of candles qualifies.
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 |
| maxPriorSlope | prior slope must be below | -1 |
| matchTolAtr | how closely two levels must match, in ATR | 0.05 |
| 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.
Two consecutive candles whose lows sit within a small tolerance of each other, following a decline. The tolerance is expressed in ATR units rather than price, so the same definition works on any instrument. The detector also requires a prior downtrend, so the same shape in the wrong context is not counted.
It is read as bullish. Traditionally read as a support level being tested twice and holding.
Not a TA-Lib formation, and “the same low” is never exactly the same on real data — which is why the tolerance is an explicit parameter rather than an equality test. Set it too wide and every pair of candles qualifies.
As an executable rule over open, high, low and close, with 4 named parameters — including bars of prior trend inspected 5, prior slope must be below -1, how closely two levels must match, in ATR 0.05 — 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.
Same shape, opposite reading
The shapes are close, and the prior trend is what decides which one fired: this rule requires a preceding downtrend, its mirror a preceding uptrend.
Tweezer Top: Two candles making almost exactly the same high, after a rise.