Harmonic patterns are geometric price structures whose legs conform to specific Fibonacci ratios. Instead of eyeballing a shape, harmonic traders measure each leg and only trade the pattern when its proportions fall within tight tolerances. The reward is a precise reversal zone with clearly defined risk.
The XABCD structure
Nearly all harmonic patterns share the same skeleton: five points labelled X, A, B, C and D, forming four legs (XA, AB, BC, CD). Point D is the potential reversal zone (PRZ) — the price where the pattern completes and a trade is considered. What separates a Gartley from a Bat or a Crab is simply the ratio each leg must meet.
The universal trade idea is to enter at D in the direction opposite to the CD leg, expecting a reversal, and to place a stop beyond X. If price pushes through X, the pattern has failed and the structure no longer holds — a clean, objective invalidation point.
- X, A, B, C, D — four legs and one completion point.
- D is the potential reversal zone where you consider a trade.
- Entry at D, targeting a retrace of the CD or AD leg.
- Stop beyond X — the level that invalidates the whole pattern.
Harmonic patterns are XABCD shapes defined by Fibonacci ratios — enter at D, target a retrace, and place the stop beyond X.
Be realistic: harmonic patterns are subjective to identify and no pattern completes perfectly every time. Treat the ratios as tolerances, always wait for confirmation at D, and never abandon your stop just because the shape looked textbook.