Reversal Pattern Research - Entry Trigger Library
Page ID: 33fd5568-29bd-81f3-9525-de778c18378d
Created: 2026-04-11T13:10:00.000Z
Last Edited: 2026-04-11T13:10:00.000Z
URL: https://www.notion.so/Reversal-Pattern-Research-Entry-Trigger-Library-33fd556829bd81f39525de778c18378d
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- Name: Reversal Pattern Research - Entry Trigger Library
Content
Detailed guide to bullish reversal patterns relevant for biotech entry triggers. Includes simplified schematic charts and systematic implementation notes.
Reversal Pattern Research for Biotech Entry Triggers
Objective
This document organizes the main bullish reversal pattern families relevant for discretionary biotech trading and future systematic entry triggers. Focus is on patterns that can be translated into entry confirmation rules rather than vague visual labels.
1. Bullish Engulfing
Structure
Figure: 01_bullish_engulfing.png
- Appears after a short-term down move
- Candle 1: bearish real body
- Candle 2: bullish real body that fully engulfs the prior real body
Visual
Day 1 ███░ Day 2 ░██████ Conceptually: sellers press down, then buyers overwhelm the full prior day’s body.
What it means
This is one of the most common two-candle reversal patterns. It signals that supply was dominant on the prior bar, but the next session absorbed that selling and reversed control.
What matters most
- Better after a clear downswing, not in random chop
- Better when Candle 2 closes near the high
- Better when volume expands
- Better when it reclaims a reference level (prior day high, short MA, local support)
Strengths
- Easy to define
- Frequent enough for testing
- Good as first-pass reversal trigger
Weaknesses
- Too common by itself
- Many false positives in volatile biotech names
- Needs context filter
Best systematic use
Use as a confirmation bar, not a standalone signal. For example:
- downtrend + oversold condition + bullish engulfing + close above prior candle high
2. Piercing Pattern
Structure
Figure: 02_piercing_pattern.png
- Appears after decline
- Day 1: strong bearish candle
- Day 2: opens weak / below prior close, then closes above the midpoint of Day 1 body
- But does not fully engulf the whole body
Visual
Day 1 ██████ Day 2 ░████ Second candle penetrates deeply into prior bearish body.
What it means
Selling pressure was strong, but the next session rejects the weakness and recovers more than half the prior damage. It is weaker than a bullish engulfing but still important.
What matters most
- Close above 50% of the prior body is key
- Better if it also closes above prior open or near intraday high
- Better near major support / prior breakdown area
Strengths
- Captures early reversal attempts
- Slightly more selective than many 1-candle reversals
Weaknesses
- Often just a dead-cat bounce in high-vol biotech
- Needs follow-through confirmation
Best systematic use
Require one more confirmation rule:
- enter only if next day breaks Day 2 high
3. Morning Star
Structure
Figure: 03_morning_star.png
- Three-candle bullish reversal
- Candle 1: long bearish candle
- Candle 2: small indecision candle / compressed body
- Candle 3: strong bullish candle closing well into Candle 1 body
Visual
Day 1 ██████ Day 2 ░░ Day 3 ░██████
What it means
This pattern represents a transition:
- aggressive selling
- loss of downside momentum
- bullish takeover
Why traders like it
It expresses exhaustion + transition + confirmation better than simple 1-2 bar setups.
What matters most
- Candle 1 should be meaningfully bearish
- Candle 2 should show contraction / hesitation
- Candle 3 should be strong and close deep into Candle 1 body
- Extra strong if Candle 3 breaks structure, not just forms a green candle
Strengths
- Strong narrative structure
- Good visual clarity
- Better reversal quality than many single-bar patterns
Weaknesses
- Lower frequency
- Gap logic from classic Japanese definitions matters less in modern equities
- Can be too strict if coded literally
Best systematic use
Use a relaxed form:
- large down bar
- small hesitation bar
- bullish reclaim bar that closes above prior 2-bar midpoint or breaks Day 1 high / Day 2 high
4. Bullish Key Reversal
Structure
Figure: 04_bullish_key_reversal.png
- During a down move, price makes a new low
- Then reverses sharply and closes strongly higher
- Often closes above prior close or above prior high in stricter versions
Visual
Prev low support: -------- Today: wick below support, close back up
What it means
The market probes lower, finds liquidity, but cannot sustain lower prices. The same session flips control back to buyers.
This is very close to your style
Especially when you define it as:
- break to new low
- then bullish bar that reclaims prior bearish candle high
What matters most
- New low should be meaningful (recent swing low, 20d low, support test)
- Close should recover strongly from the low
- Better if range is wide and volume is high
Strengths
- Clear failed-breakdown logic
- Good stop placement under the reversal low
- Often catches sharp V-type turns
Weaknesses
- Can be very noisy in biotech after news shocks
- Needs context to avoid catching falling knives too early
Best systematic use
Define objective references:
- new 20d low or break of prior swing low
- close above prior candle high or above same-day midpoint threshold
5. Bullish Outside Reversal / Outside Bar Reversal
Structure
Figure: 05_bullish_outside_reversal.png
- Current candle’s range exceeds prior candle’s entire range
- Often low is lower than prior low and high is higher than prior high
- Bullish version closes strong, ideally near high
Visual
Day 1 |----| Day 2 |--------outside--------|
What it means
Volatility expands and the current bar fully overwhelms the prior bar. In reversal context this shows a strong transfer of control from sellers to buyers.
Difference vs engulfing
- Engulfing focuses on body
- Outside reversal focuses on full range
What matters most
- Strong bullish close matters more than just being outside
- More meaningful after panic selloff / flush
- Better with volume spike
Strengths
- Strong momentum shift signal
- Useful in volatile biotech names where body-only patterns miss intraday drama
Weaknesses
- Can also appear in chaotic news-driven whipsaw
- Needs location filter (near lows/support, not mid-range)
Best systematic use
- outside bar + close in top 25% of daily range
- ideally after short sequence of down bars
6. Wyckoff Spring
Structure
Figure: 06_wyckoff_spring.png
- Price breaks below a known support / trading range low / prior swing low
- Breakdown fails quickly
- Price re-enters the prior range
Visual
Support ----------------- Price __ false break ___ reclaim back above support
What it means
This is a false breakdown / bear trap. Weak hands panic out, breakout sellers pile in, then price snaps back above support. That failed breakdown becomes the reversal catalyst.
Why it matters
For discretionary bottom-fishing, this is one of the most powerful concepts because it is not just a candle pattern — it is a liquidity event.
What matters most
- Support level must be real
- Breakdown should be rejected quickly
- Reclaim should be decisive
- Volume expansion often helps
Strengths
- Strong structural logic
- Very natural fit for biotech oversold reversals
- Excellent risk definition: stop under spring low
Weaknesses
- Support definition can be subjective
- Some failed breakdowns keep failing again
- News-driven collapses can invalidate springs fast
Best systematic use
- break below prior N-day low or swing low
- within 1-3 bars reclaim that low / support level
- entry on reclaim or break of spring-bar high
7. 2B Reversal (Trader Vic style)
Structure
Figure: 07_2b_reversal.png
- Market makes a new low versus a prior reference low
- It fails to continue down
- Then price turns back up through a nearby trigger level
Visual
prior low x new lower low x (fails) reclaim ^ trigger back up
What it means
This is the classic failed breakdown reversal pattern. It is closely related to the spring, but framed more explicitly as a failed new low rather than a trading-range event.
Why it is highly relevant here
Your discretionary rule:
- a candle makes the new low
- then a bullish candle breaks that low-candle’s high is almost a textbook 2B-style trigger.
What matters most
- The prior low being violated should be meaningful
- The new low should fail quickly
- Entry trigger should be objective
- close above low-bar high
- or next day break above low-bar high
Strengths
- Extremely easy to formalize
- Very clean stop placement
- Good combination of structure + confirmation
Weaknesses
- Can trigger late if reclaim threshold is too strict
- Too loose a prior-low definition creates noise
Best systematic use
This is probably the first one to test. Suggested prototype:
- new 20-day low
- within 3 bars price closes above the high of the low-setting candle
- optional volume filter
- optional oversold filter
8. 3-Bar Flush → Reclaim Pattern
Structure
Figure: 08_3bar_flush_reclaim.png
This is not a classical named Japanese pattern, but a very tradable modern reversal structure.
- 3 consecutive bearish candles
- at least 2 of them push to lower lows
- final bearish candle stretches downside momentum
- next bullish candle breaks above the high (or body top) of the final bearish candle
Visual
Bar 1 ███ Bar 2 ███ Bar 3 ███ ← exhaustion leg Bar 4 ░████ ← reclaim trigger
What it means
This captures:
- directional downside pressure
- emotional flush
- immediate reclaim / absorption
Why it fits biotech
Biotech names often overshoot to the downside over 2-4 sessions, then reverse violently when selling exhausts. This pattern is designed for that exact behavior.
What matters most
- Consecutive down bars should be real, not tiny chop candles
- Better if Bar 3 makes a short-term low extension
- Better if Bar 4 is wide-range and closes strong
Strengths
- Matches real discretionary trading behavior
- Strong psychological logic
- Can be parameterized flexibly
Weaknesses
- Not standardized, so rules must be carefully defined
- Too loose a version will overfire in noise
Best systematic use
Suggested prototype:
- 3 consecutive down closes
- bar 3 sets a 10-20d low or closes below BB lower band
- entry when next bar breaks bar 3 high
- optional requirement: volume on reclaim > 20d average
Practical Ranking for Systematic Testing
If the goal is biotech entry trigger research, the highest-priority patterns to test are:
- 2B Reversal / Spring reclaim
- 3-bar flush → reclaim
- Bullish key reversal
- Bullish outside reversal
- Morning Star (relaxed rules)
- Bullish engulfing
- Piercing pattern
Reason: the first 3 rely on structural failed breakdown logic, which is likely more robust in biotech than generic textbook candlestick labels.
How to Translate into an Entry Trigger Framework
Use this 3-layer structure:
Layer 1: Universe Filter
Examples:
- top decile net_cash_to_mcap
- min market cap
- phase / dilution filters
Layer 2: Setup Context
Examples:
- oversold state
- recent downside sequence
- local low test / breakdown attempt
- BB lower band breach
Layer 3: Trigger
Examples:
- break above low-bar high
- break above final bearish candle high
- close above reclaim threshold This is the cleanest way to convert discretionary reversal trading into testable rules.
Preliminary Recommendation
For the next research phase, start with two formal candidates:
Candidate A: 2B / Spring Trigger
- New 20-day low
- Within 1-3 bars, price closes above the high of the low-setting bar
- Optional: volume > 1.2x 20-day average
Candidate B: 3-Bar Flush Reclaim Trigger
- 3 consecutive bearish closes
- Final bar makes lower low and closes weak
- Next bar breaks prior bar high
- Optional: prior bar below BB lower band or SMA20 * 0.95 These two are the closest to your stated discretionary style and the easiest to formalize for backtesting.