Chart Patterns

Chart patterns are recurring geometric formations on price charts that have historically preceded specific types of price movement. They are visual representations of the ongoing battle between buyers and sellers, and when recognized early, they can provide actionable trade setups with defined entries, stop losses, and profit targets.

The study of chart patterns has a long history in technical analysis. Thomas Bulkowski's Encyclopedia of Chart Patterns, one of the most data-driven references on the subject, catalogs dozens of patterns with statistical performance data across tens of thousands of trades. His work provides the empirical foundation for pattern-based trading, transforming what might seem like subjective visual interpretation into a quantifiable framework.

Chart patterns fall into three categories based on their typical resolution: reversal patterns (which signal a change in the prevailing trend), continuation patterns (which signal a pause before the trend resumes), and bilateral patterns (which can break in either direction).

Reversal Patterns

Reversal patterns form at the end of a trend and signal that the current direction is likely to change. They require an existing trend to reverse, a "reversal" pattern in a sideways market is a contradiction. The larger and longer-forming the pattern, the more significant the expected reversal.

Head and Shoulders

The head and shoulders (H&S) is widely regarded as one of the most reliable reversal patterns.

Inverse head and shoulders is the mirror image, appearing at the bottom of a downtrend with three troughs (left shoulder, deeper head, right shoulder). It signals a potential reversal to the upside. The measured move target is projected upward from the neckline breakout.

Key characteristics of a valid head and shoulders:

• Volume typically declines from the left shoulder to the right shoulder, with a volume surge on the neckline break.
• The neckline does not need to be perfectly horizontal, it can slope slightly up or down.
• A retest of the broken neckline (a pullback to the neckline from below in an H&S top) is common and can provide a second entry opportunity.

Double Top and Double Bottom

A double top forms when price reaches a resistance level twice and fails to break through both times, creating two peaks at roughly the same level with a trough (valley) between them.

• Completion: The pattern completes when price breaks below the trough between the two peaks.
• Measured target: The distance from the peaks to the trough, projected downward from the breakout point.
• Bulkowski statistics: Double tops have an average decline of approximately 19.5% after a downward breakout, with a failure rate of around 16%.

A double bottom is the inverse, two troughs at roughly the same level with a peak between them, signaling a potential reversal from a downtrend to an uptrend. It completes when price breaks above the peak between the troughs.

Triple Top and Triple Bottom

Less common than double tops and bottoms, triple tops and bottoms involve three tests of the same level. The additional test can make the pattern more reliable when it finally completes, because it demonstrates repeated failure to break through that level.

• Triple top: Three peaks at similar levels, completed by a break below the support connecting the troughs.
• Triple bottom: Three troughs at similar levels, completed by a break above the resistance connecting the peaks.

Bulkowski's data indicates that triple bottoms perform slightly better than double bottoms, with an average rise of approximately 37% after an upward breakout.

Continuation Patterns

Continuation patterns form during a pause or consolidation within an existing trend. They suggest that the prevailing trend will resume once the pattern completes. These patterns typically form more quickly than reversal patterns.

Flags

Characteristics of a valid flag:

• A strong, near-vertical move preceding the pattern (the flagpole).
• A compact, counter-trend consolidation lasting typically 1-3 weeks on a daily chart.
• Declining volume during the flag formation, with a volume increase on the breakout.
• The breakout should occur in the direction of the flagpole.

Pennants

A pennant is similar to a flag but instead of a rectangular consolidation, it forms a small symmetrical triangle. The converging trend lines of the pennant show tightening price action before the continuation breakout.

• Pennants typically resolve within 1-3 weeks.
• Volume contracts during formation and expands on breakout.
• The measured move target is the same as flags, the flagpole length projected from the breakout point.

Rectangles

A rectangle (or trading range) is a horizontal consolidation where price bounces between parallel horizontal support and resistance levels. While rectangles can resolve in either direction, they are classified as continuation patterns when they form within a clear trend and break in the trend's direction.

• Measured target: The height of the rectangle projected from the breakout point.
• Rectangles can last for weeks or months, making them larger consolidation patterns than flags or pennants.

Bilateral Patterns

Bilateral patterns can break in either direction, making them more challenging to trade. The key is to wait for the breakout and not anticipate which direction it will take.

Triangles

Triangles are the most common bilateral patterns. They form when price consolidates between converging trend lines, creating a triangle shape. There are three types:

Ascending triangle: A horizontal resistance line on top and a rising support trend line on the bottom. While it is often considered a bullish continuation pattern (Bulkowski's data shows it breaks upward about 64% of the time), it can break downward. The rising lows indicate increasing buying pressure, while the flat top shows consistent resistance.

Descending triangle: A horizontal support line on the bottom and a falling resistance trend line on top. This is the mirror of the ascending triangle and is often considered bearish. It breaks downward approximately 64% of the time according to Bulkowski. The falling highs indicate increasing selling pressure against a flat floor.

Symmetrical triangle: Both trend lines converge toward each other at roughly equal angles. This is a true bilateral pattern with no directional bias, it breaks in the direction of the prevailing trend approximately 54% of the time. The converging lines represent a balance of buying and selling pressure that is tightening before a resolution.

Wedges

Wedges are similar to triangles but both trend lines slope in the same direction:

Rising wedge: Both lines slope upward, with the lower line rising more steeply than the upper line (converging upward). Despite the upward slope, this is typically a bearish pattern, it shows diminishing buying momentum. Bulkowski's data indicates a downward breakout occurs approximately 69% of the time.

Falling wedge: Both lines slope downward, with the upper line falling more steeply than the lower line (converging downward). Despite the downward slope, this is typically a bullish pattern. It breaks upward approximately 68% of the time.

Wedges are particularly useful because their directional bias runs counter to their visual slope, making them a favorite among experienced traders who can spot the deception.

Pattern Measurement and Targets

Most chart patterns have a standard measured move technique for setting price targets:

These targets are approximations, not guarantees. Bulkowski's research shows that measured targets are met about 55-75% of the time depending on the pattern. It is prudent to set your actual take-profit slightly short of the full measured move to account for this variability.

Important Caveats About Pattern Trading

Completion rates vary. Not every pattern that begins to form will complete. A head and shoulders that never breaks its neckline is simply three peaks, it is not a pattern until the breakout occurs. Never trade a pattern before it completes.

Context matters more than shape. A double top at a major weekly resistance level after a strong uptrend has very different implications than a double top in the middle of a sideways range. Always evaluate patterns within the broader market context.

Volume confirms. In equity markets, volume analysis is integral to pattern confirmation. In forex, where centralized volume data is unavailable, traders use tick volume as a proxy or rely more heavily on the candlestick price action at the breakout point.

Practice identification first. Before trading patterns, spend weeks identifying them on historical charts without placing trades. Train your eye to see the patterns in real time, note their completion rates, and measure whether the targets were reached. This deliberate practice builds the visual literacy needed for real-time application.

Key Takeaways

• Chart patterns are categorized as reversal, continuation, or bilateral based on their typical resolution direction.
• Reversal patterns (head and shoulders, double top/bottom, triple top/bottom) form at the end of trends and signal potential direction changes.
• Continuation patterns (flags, pennants, rectangles) form during pauses within trends and suggest the trend will resume.
• Bilateral patterns (triangles, wedges) can break in either direction, wait for the breakout rather than anticipating it.
• Measured move targets provide price objectives by projecting the pattern's height from the breakout point. They are met approximately 55-75% of the time.
• Bulkowski's statistical research provides empirical data on pattern performance, bull flags, ascending triangles, and head and shoulders are among the most reliable patterns.
• A pattern is not valid until it completes. Never trade anticipating a breakout that has not yet occurred.
• Pattern failures can be powerful signals, trapped traders on the wrong side of a failed pattern accelerate the move in the opposite direction.
• Context, volume, and confluence with other technical factors significantly improve the reliability of any chart pattern.

This lesson is for educational purposes only. It does not constitute financial advice. Trading forex involves significant risk of loss and is not suitable for all investors.