Forex Harmonic

The Deep Crab Pattern

Harmonic Pattern Example: Bearish Deep Crab

The Deep Crab Pattern    

The Deep Crab is a variant of the regular Crab pattern. It is still a 5-point extension, and it still has the endpoint (D) at the 161.8% extension of XA, but the AB=CD importance is a little different.


The most distinguishing component of this pattern is the importance of the specific 88.6% retracement point of B. Along with the Crab Pattern, the Deep Crab Pattern presents an especially extended and long move towards D.

Carney stressed that the Crab and Deep Crab represent significant overbought and oversold conditions, and reaction after completion is often sharp and quick. It is the opinion of many traders and analysts that the Crab Pattern and Deep Crab represent some of the fastest and profitable patterns out of all harmonic patterns.

Deep Crab differences from the Crab

  1. BC leg projection is not as extreme as the Crab.
  2. B must be at least an 88.6% retracement. Common to move more than 88.6% retracement level not above/below X (not above X in a Bearish Deep Crab and not below X in a Bullish Deep Crab).
  3. AB=CD pattern variations are more important in the Deep Crab Pattern.
  4. The BC leg is a minimum of 224% but can extend to 361.8%.

Sources: Carney, S. M. (2010). Harmonic trading. Upper Saddle River, NJ: Financial Times/Prentice Hall.  Gilmore, B. T. (2000). Geometry of markets. Greenville, SC: Traders Press.  Pesavento, L., & Jouflas, L. (2008). Trade what you see: how to profit from pattern recognition. Hoboken: Wiley.


By Arthur Simmons

Educator, writer and trader with a private equity fund located in the US. Trading methodology based on astronomical and Gann based time cycles with a focus on price action only charting for trade execution and trade management.

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