Price Action Playbook: Deep 4-Leg Bear Pullback (L4) (pa-pullback-low4) —— Brooks Canonical Reference, Microstructure & Asymmetric Edge

Editor’s Note: Bar counting (High 1-4 / Low 1-4) is Al Brooks’ most celebrated and rigorous price action taxonomy. By systematically tracking each countertrend push, it captures the progressive decay of countertrend momentum and the decisive ambush by primary trend institutions. This playbook leverages canonical Brooks doctrine alongside 10 years of multi-asset futures empirical backtests to detail its microstructure dynamics and execution protocols. This playbook examines 【Deep 4-Leg Bear Pullback (L4)】 comprehensively, bridging canonical references, microstructure causality, decade-long empirical data, and finite state machine execution.

1. Al Brooks Canonical References & Foundational Tenets

The Brooks trilogy establishes meticulous criteria for bar counting, placing particular emphasis on count resets, signal bar validity, and trap identification:

• Canonical Literature Citations:
  • Trading Price Action Trends, Chapter 4: Low 4 and Complex Pullbacks (pp. 110–125)
  • Trading Price Action Ranges, Chapter 10: Complex Pullbacks in Bear Trends (pp. 225–240)
  • Trading Price Action Ranges, Chapter 32 Glossary (p. xxiv)
• Verbatim Canonical Quotation:

  “A Low 4 is a complex bear pullback that has had four attempts to reverse down. By the fourth push, the market has usually transitioned into a trading range. Although a Low 4 can still trigger trend resumption, traders should wait for a confirmed breakout bar to prevent getting chopped in the range.”
  —— Al Brooks, Reading Price Charts Bar by Bar & Trading Price Action Trilogy (John Wiley & Sons)

• Core Foundational Rules:
  1. Low 4 Range Evolution: A bear pullback extending into four attempts has structurally degraded into a sideways trading range.
  2. Breakout Mode Neutrality: Directional bear edge decays to ~50%; auction equilibrium requires confirmation before trading.
  3. Strict Confirmation Protocol: Require a solid bear trend bar closing outside the complex range before committing capital.

2. Microstructure Causality & Order Book Dynamics

In order book mechanics, each bar count iteration marks another wave of aggressive countertrend liquidity being absorbed and converted into fuel for trend resumption:

The microstructure of Low 4 reflects protracted trench warfare between bears and bottom-fishers evolving into a balanced trading range:

1. Repeated Thrust Failures: Four sequential attempts create multi-layered bid/ask books, equalizing buying and selling pressure.
2. Coiled Energy Resolution: Extended chop exhausts emotional capital. The subsequent perimeter breakdown unleashes major expansion.

3. Geometric Anatomy & Automated Validation Gates

3.1 Strict Invalidation Gates

Bar counting cannot be done haphazardly. It requires strict algorithmic adherence to overlap thresholds, micro-channel boundaries, and reset rules:

1. Four Thrust Sequence: Must verify 4 distinct downward attempts within the correction.
2. Rangebound Flatness: Price oscillates horizontally as 20-EMA flattens.
3. Decisive Close Outside: Entry requires a bear trend bar to close decisively outside the consolidation floor.
4. Hard Stop Anchor: Protective stop anchored 1 tick above consolidation ceiling (-1.0R).

4. Ten-Year 54-Symbol Empirical Attribution (2015–2026)

A decade of systematic trade data across 54 Chinese commodity futures demonstrates the robust law of large numbers underpinning systematic bar counting setups:

• Total Completed Trade Sample: 4880 standard executions
• Empirical Win Rate: 34.1%
• Profit Factor (PF): 1.33
• Average Payoff Ratio (R:R): 2.42 : 1
• Per-Trade Mathematical Expectancy: +0.17R
• Historical Benchmark Symbol: SHFE.BU (Profit Factor reached 1.33)

4.1 Expectancy Decomposition: Asymmetric Convexity and Long-Tail Payoffs

Under Al Brooks’ Trader’s Equation: $\text{EV} = (34.1\% \times 2.42) - (65.9\% \times 1.0) = +0.17R$ This statistical profile embodies the institutional holy grail of convexity: while the nominal win rate sits at 34.1%, the asymmetric 2.42:1 payoff ratio transforms the mathematical outcome. By strictly truncating adverse moves at -1.0R and capturing extended runners, the setup extracts +0.17R in positive expectancy.

5. Morphological Taxonomy & Comparative Matrix

Different iteration counts (such as first entry versus high-conviction second entry) possess fundamentally divergent edges, mapped out below:

6. Four-Stage Execution Lifecycle & Finite State Machine

Bar count progressions follow an orderly state evolution. The execution state machine monitors count maturity and manages entry orders seamlessly:

flowchart TD
    A["阶段 1: 监测低 4 (PENDING)
经历四推拉锯形成横盘区间
等待大实体阴线收盘在区间外"] --> B["阶段 2: 跌破触发 (TRIGGERED)
收盘在区间下沿外瞬间进场
止损硬编码锁定在区间上沿 (-1.0R)"]
    B --> C["阶段 3: 阶梯护航 (TRAILING)
脱离成本 +1.0R 移至平保
按前 2 棒高点动态下移止损"]
    C --> D["阶段 4: 终局离场 (CLOSED)
达到测算目标 (+2.42R)
全量平仓兑现"]

1. Stage 1 · Setup Pending (PENDING_SETUP): Track Low 4 range consolidation; wait for a strong bear bar to close outside the range.
2. Stage 2 · Order Triggered (ENTRY_TRIGGERED): Breakdown triggers entry; hard stop anchored above consolidation ceiling (-1.0R).
3. Stage 3 · Breakeven & Trailing (BREAKEVEN_TRAILING): Move stop to breakeven at +1.0R; trail via dynamic 2-bar high.
4. Stage 4 · Position Closed (POSITION_CLOSED): Target locked at range measured move (+2.42R) or trailing stop breach.

7. Forensic Micro-Case Study: SHFE.BU Live Slice

Across 4,880 executions, SHFE.BU (Bitumen Futures) delivered a 1.33 Profit Factor and 2.42:1 payoff ratio on Low 4 setups. Exhausting four-push consolidations cleanly flush stubborn bottom-fishers before launching decisive downward trends.

Within historical workbench samples, traders can examine the physical slice of NASDAQ.NVDA (Bar #126):

• Market Sample Fingerprint: workbench_tv_US_NVDA_2026-09-11.json
• Signal Bar Position: Physical Bar Index #126
• Interactive Forensic Replay: Open Workbench in Zero-Hindsight Mode

8. Cross-Reference Network & Related Playbooks

To build a multi-dimensional mental model of price action, we recommend exploring these interconnected resources:

1. Direct Tactical Neighbor: Low 3 Wedge Bear Flag (pa-pullback-low3)
2. Foundational Trend Benchmark: Consecutive Strong Trend Bars (pa-consecutive-bars)
3. Asset Deep Dive Dossier: SHFE.BU Forensic Analysis Report
4. Comprehensive Pattern Leaderboard: 54 BPA Patterns Win Rate & Payoff Directory
5. Algorithmic Strategy Engine: Al Brooks Quantitative Strategy Suite