Encyclopedia of Chart Patterns

1. Embrace Data-Driven Analysis for Chart Patterns

As an engineer I wanted hard, cold facts, not fuzzy platitudes. So, I wrote this book.

Quantify trading decisions. The core philosophy of this encyclopedia is to move beyond anecdotal evidence and provide empirical data for chart patterns. Instead of vague statements like "a head-and-shoulders formation works most of the time," the book offers precise statistics on success rates, average price movements, and failure probabilities across various market conditions. This rigorous approach allows traders to make informed decisions based on quantifiable risk and reward.

Experience through data. The author's journey from relying on fundamental research to embracing technical analysis, driven by a desire for concrete facts, underpins the book's value. By analyzing over 38,500 chart pattern samples, the book transforms raw data into actionable insights, offering a simulated "experience" that would otherwise take years to acquire. This extensive database covers both bull and bear markets, providing a comprehensive view of how patterns behave under different market temperaments.

Beyond simple identification. The book goes beyond merely identifying patterns, delving into their nuances:

• Average rise or decline
• Failure rates at different profit targets
• Impact of volume trends and breakout volume
• Influence of pattern size and shape
• Likelihood and impact of throwbacks/pullbacks

This detailed statistical breakdown empowers traders to understand the true probabilities behind each pattern, moving from "voodoo" to verifiable science.

2. Market Context is Paramount for Trading Success

Think of it as a rising tide that lifts all boats.

Align with market trend. A recurring theme across all chart patterns is the significant impact of the broader market trend (bull or bear) on a pattern's performance. Trading with the prevailing market trend consistently yields better results, whether it's buying bullish patterns in a bull market or shorting bearish patterns in a bear market. Countertrend trades, while sometimes profitable, generally exhibit higher failure rates and smaller average gains or declines.

Market influence is quantifiable. The book provides specific statistics comparing pattern performance against the S&P 500's movement during the same period. For instance:

• Broadening Bottoms: Upward breakouts in a bull market average a 27% rise, while the S&P 500 rises 14%.
• Head-and-Shoulders Tops: Average decline is 19% in a bull market (S&P +1%) vs. 29% in a bear market (S&P -13%).
• Dead-Cat Bounces: Post-bounce decline is 30% in a bull market vs. 40% in a bear market.

Industry context matters. Beyond the general market, the performance of other stocks within the same industry can offer crucial predictive clues. If an industry is showing widespread weakness, even a technically strong bullish pattern in one of its stocks might be a risky bet, as it would be "swimming against the current." Conversely, an industry-wide bullish trend can amplify the success of a well-formed pattern.

3. Master Breakout Dynamics and Confirmation

A breakout occurs when price closes above the formation’s high (upward breakout) or below the pattern’s low (downward breakout).

Confirmation is non-negotiable. A pattern is not truly "valid" until price definitively closes beyond its established boundaries. This confirmation is a critical signal for entry or exit. For example, a double bottom is only confirmed when price closes above the highest high between the two troughs. Premature entries, before confirmation, significantly increase risk and often lead to losses.

Breakout direction is not always intuitive. While some patterns have a higher probability of breaking out in a certain direction (e.g., Falling Wedges often break upward), it's never guaranteed. The book emphasizes waiting for the actual breakout to dictate your trade direction, rather than anticipating it. For instance, Descending Triangles, despite their bearish appearance, break out upward 30% of the time.

Timing the breakout. The time from a pattern's completion to its breakout varies:

• Quick breakouts (2-4 days): Bump-and-Run Reversals, Flags, Gaps. These demand swift action.
• Moderate breakouts (2-5 weeks): Broadening Formations, Double Bottoms, Head-and-Shoulders. These offer more time for analysis.
• Longer breakouts (1-4 months): Rounding Bottoms. Patience is key here.

Understanding these dynamics helps traders prepare for the speed of execution required for different patterns.

4. Understand and Mitigate Pattern Failure Rates

The failure rates climb quickly as the maximum price rise or decline changes.

Probability, not certainty. Chart patterns are exercises in probability, not guarantees. The book meticulously details "break-even failure rates" (patterns failing to move more than 5% in the breakout direction) and how these rates escalate dramatically for larger price targets. For example, a Broadening Bottom in a bull market has a 10% break-even failure rate, but 59% fail to achieve a 25% rise.

Failure is a trading signal. A "busted pattern" – where price moves less than 5% in the breakout direction before reversing – is often a powerful signal to trade in the new direction. For instance, a busted Head-and-Shoulders Top can lead to a 40% rebound. Recognizing these reversals quickly can turn a potential loss into a profitable opportunity.

Quantifying risk tolerance. The detailed failure rate tables allow traders to:

• Assess risk: Understand the likelihood of a pattern not reaching a desired profit target.
• Set realistic expectations: Adjust profit targets based on historical probabilities.
• Inform stop-loss placement: Knowing how often patterns fail at certain thresholds helps in setting tighter, more effective stops.

This data-driven understanding of failure is crucial for managing expectations and protecting capital.

5. Volume Provides Crucial Confirmation Signals

Volume is usually highest on the left shoulder, followed by the head. The right shoulder shows the lowest volume of the three peaks.

Volume validates price action. Volume is a critical, yet often overlooked, component of chart pattern analysis. It provides insight into the conviction behind price movements. The book consistently analyzes volume trends (rising, falling, U-shaped, dome-shaped) and breakout day volume for each pattern.

Key volume insights:

• Receding volume: Often seen in consolidation patterns like Symmetrical Triangles, suggesting a coiled spring effect.
• Heavy breakout volume: Generally confirms the strength of a breakout, propelling prices further. However, for some patterns (e.g., Rounding Tops, Earnings Flags), light breakout volume can surprisingly lead to better performance, possibly due to less immediate profit-taking.
• Volume distribution within patterns: For Head-and-Shoulders Tops, declining volume from the left shoulder to the right shoulder is a classic bearish confirmation.

Volume shapes as predictors: Specific volume patterns can offer predictive power:

• U-shaped volume: Often associated with Rounding Bottoms and can indicate better post-breakout performance for some patterns (e.g., Adam & Adam Double Bottoms).
• Dome-shaped volume: Common in Rounding Tops and can be a positive indicator for certain patterns (e.g., Right-Angled Ascending Broadening Formations).

Analyzing volume adds another layer of probabilistic insight to trading decisions.

6. Anticipate Post-Breakout Behavior: Throwbacks and Pullbacks

Throwbacks and pullbacks hurt performance.

Common post-breakout retracements. After a breakout, it's common for price to retrace back to the pattern's boundary. These are called "throwbacks" (for upward breakouts) or "pullbacks" (for downward breakouts). They occur in roughly 50-70% of patterns and typically complete within 1-2 weeks.

Impact on performance: While offering a second chance to enter a trade, throwbacks and pullbacks generally hurt post-breakout performance. This is because they interrupt momentum. For example, a Head-and-Shoulders Bottom in a bull market rises 32% with a throwback, but 43% without one.

Strategic implications:

• Entry timing: If you missed the initial breakout, waiting for a throwback/pullback to complete (and price to resume the breakout direction) can offer a lower-risk entry point.
• Risk assessment: Before trading, identify potential overhead resistance (for upward breakouts) or underlying support (for downward breakouts) that could trigger a throwback/pullback. Avoid trades where such zones are too close, as they can stifle the breakout's momentum.
• Exit strategy: For short-term traders, selling before a likely throwback/pullback can lock in profits, even if it means missing a larger move.

Understanding these retracements is vital for managing trade entries, exits, and overall risk.

7. Optimize Pattern Selection with Key Characteristics

Tall patterns perform better than short ones; narrow ones perform better than wide ones.

Size and shape matter. Beyond basic identification, specific characteristics of a pattern's size and shape can significantly influence its post-breakout performance. The book quantifies these relationships, allowing traders to filter for the most promising setups.

Key characteristics to consider:

• Height: "Tall" patterns (e.g., Head-and-Shoulders Bottoms, Descending Triangles) generally outperform "short" ones, as they represent a larger consolidation or reversal of price energy.
• Width/Length: "Narrow" patterns (e.g., Triple Bottoms, some Symmetrical Triangles) often perform better, suggesting a tighter coil of energy. However, for some patterns (e.g., Broadening Bottoms, Falling Wedges), "wide" patterns can be superior.
• Combination of height and width: Often, specific combinations (e.g., "tall and narrow" or "tall and wide") yield the best results, outperforming individual characteristics. For instance, Tall and Narrow Adam & Adam Double Bottoms in a bull market rise 44%.
• Internal structure: For patterns like Double Bottoms, the relative height of the two troughs (e.g., "lower right bottom") can be a performance enhancer.

By applying these filters, traders can increase the probability of selecting patterns with higher profit potential and lower failure rates.

8. Implement Robust Risk Management with Stop-Loss Orders

You will make an investment in a chart pattern and the trade will go bad. Maybe you will stumble across a herd of bad trades and get flattened.

Protecting capital is paramount. The author's personal experience with significant losses underscores the absolute necessity of risk management. No pattern is foolproof, and even the most reliable setups can fail. A stop-loss order is not just a tool for professionals; it's a fundamental safeguard for every trader.

Strategic stop placement:

• Below support/above resistance: For bullish patterns, place stops slightly below a key support level (e.g., the lowest low of a bottom pattern). For bearish patterns, place stops slightly above a key resistance level (e.g., the highest high of a top pattern).
• Dynamic stops: As a trade moves in your favor, adjust your stop-loss order to lock in profits or move to a break-even point. For example, after a bullish breakout, raise your stop to just below the prior minor low as price makes new highs.
• Percentage-based stops: Consider setting stops based on a percentage of your capital or the stock's volatility, rather than fixed price points, to allow for normal market fluctuations.

Learning from losses: Every losing trade is an opportunity to refine your strategy. Analyzing why a stop was hit can lead to better pattern selection, improved entry/exit timing, or more effective stop placement in the future. The goal is to "cut your losses short and let your profits run."

9. Recognize and Adapt to Event-Driven Price Patterns

If you picture in your mind the price action of JCB Superstores, you may recognize three chart patterns: a double bottom, a double top, and a dead-cat bounce.

Events shape patterns. Beyond classic chart patterns, the book introduces "event patterns" – price movements triggered by specific news events. These include earnings surprises, FDA approvals, same-store sales reports, and stock upgrades/downgrades. These events often create distinct, tradable patterns.

Key event pattern insights:

• Dead-Cat Bounce (DCB): A sharp decline followed by a temporary rebound, then further decline. Often signals a prolonged downtrend. "Do not trade any bullish chart pattern less than 6 months after a stock shows a DCB."
• Inverted Dead-Cat Bounce (iDCB): A sharp rise followed by a quick retrace. Often signals a short-term peak.
• Earnings Surprises: Can lead to significant price gaps and subsequent trends. A "bad" surprise often leads to further bad quarters (74% probability).
• FDA Approvals: Surprisingly, often lead to downward breakouts or short-lived rallies, reflecting "buy on the rumor, sell on the news."

Trading event patterns:

• Confirmation is vital: Wait for price to confirm the event's direction (e.g., close below the announcement day's low for a bad earnings surprise).
• Quick action: Event patterns often involve rapid price movements, requiring swift entry and exit.
• Short-term focus: Many event patterns are best suited for swing traders due to their short duration and potential for quick reversals.

Understanding these event-driven dynamics adds another dimension to a trader's toolkit.

10. Continuous Learning: Analyze Failures and Refine Your Strategy

If you review your paper trades, you will understand why a stop-loss order is more than a tool for the professionals.

The iterative process of mastery. The book implicitly advocates for a continuous learning cycle: research, practice (paper trading), execute, and analyze. The "Focus on Failures" section for each pattern is not just descriptive; it's prescriptive, highlighting common pitfalls and offering insights into why trades go wrong.

Key aspects of continuous learning:

• Paper trading: Experiment with new techniques without financial risk. This builds intuition and confidence.
• Post-trade analysis: Critically review every trade, especially losing ones. Ask:
  • Was the pattern correctly identified?
  • Was the market/industry context favorable?
  • Was the entry/exit timed effectively?
  • Was the stop-loss appropriately placed?
• Adaptation: The market is dynamic. What worked yesterday might not work tomorrow. The author's own updates to the book, incorporating new data and refining methodologies, exemplify this adaptive mindset.

Developing a personal style: Ultimately, the goal is not to blindly follow rules but to develop an investment style that "fits your personality." The statistics provide tools, but experience, self-awareness, and continuous refinement are what truly lead to consistent success in the markets.

Last updated: December 31, 2025