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Harmonic patterns (XABCD)

Harmonic patterns are five-point structures (X, A, B, C, D) whose swings are in specific Fibonacci proportions. The completion point D is a potential reversal zone. Oyticker shows the ratios of each leg and names the pattern when they match a standard definition.

What it's for
  • Identify five-point structures with Fibonacci proportions: Gartley, Bat, Butterfly, Crab, Deep Crab, Cypher.
  • Locate a potential reversal zone at point D.
  • Let Oyticker compute every ratio and name the pattern.
Plus and Pro toolTry it in Analyze
Points
5: X, A, B, C, D
Plan
Plus and Pro
Recognized
Gartley, Bat, Butterfly, Crab, Deep Crab, Cypher
Tolerance
±3% on each ratio

The ratios Oyticker checks

Ratios are measured in price. AB/XA is the retracement of XA at B, BC/AB the retracement of AB at C, CD/BC the extension of BC, and AD/XA the retracement (below 1) or extension (above 1) of XA at D. On the chart, each ratio is written on the dashed line joining the two points it compares.

PatternB (AB/XA)C (BC/AB)D (AD/XA)CD/BC
Gartley0.6180.382–0.8860.7861.272–1.618
Bat0.382–0.50.382–0.8860.8861.618–2.618
Butterfly0.7860.382–0.8861.272–1.6181.618–2.24
Crab0.382–0.6180.382–0.8861.6182.24–3.618
Deep Crab0.8860.382–0.8861.6182.24–3.618
Cypher0.382–0.618C extends XA to 1.272–1.414 (XC/XA)D at 0.786 of XC—

Ratios follow Scott Carney's definitions (Gartley's original pattern dates from 1935); the Cypher is credited to Darren Oglesbee. Every ratio is accepted within ±3%. The pattern is bullish when A is above X (D completes at a low, where a long is considered) and bearish when A is below X.

Examples

Bullish Gartley with ratios 0.618, 0.618, 1.44 and 0.786 and the label Bullish Gartley
A bullish Gartley: B retraces 0.618 of XA, C retraces 0.618 of AB, D completes at 0.786 of XA with CD = 1.44 × BC. Oyticker names the pattern; price rallies from D.
Bearish Bat with ratios 0.45, 0.786, 2.233 and 0.886 and the label Bearish Bat
A bearish Bat: B retraces 0.45 of XA, D completes at 0.886 of XA, with CD = 2.23 × BC. The completion at D is followed by a decline.

Reading the completion point

  • D is a potential reversal zone: the ratios tell you where to watch, not that price will turn. Wait for a reaction (a reversal candle, a momentum divergence) before acting.
  • A common invalidation is a clear move beyond X (or beyond the next Fibonacci level of XA for patterns that complete beyond X).
  • Usual targets after a reaction are the 38.2% and 61.8% retracements of the CD leg.

How to draw it

  1. Choose Patterns → Harmonic XABCD.
  2. Click X, A, B, C and D on alternating swing points.
  3. Read the ratios and the name under D. If no standard set matches, Oyticker says so; adjusting a point moves all ratios at once.

Limits

Harmonic trading relies on precise swing selection; a few cents on X or A change the ratios. The definitions vary slightly between authors, and patterns found after the fact are always cleaner than those traded live.

Charts in this guide use simulated prices generated for illustration; levels and outcomes shown are examples, not observations of a real market. Educational content only, not investment advice.

Related guides

AB=CD patternPlusHow to draw the AB=CD pattern, the BC retracement and CD extension ratios Oyticker checks, and why the equality of legs in price and time matters.Fibonacci retracementHow to draw a Fibonacci retracement from the start to the end of a swing, what the 23.6%, 38.2%, 50%, 61.8% and 78.6% levels mean, confluence and invalidation.Trend-based Fibonacci extensionPlusHow the trend-based Fibonacci extension projects the A-B swing from the end of the pullback C, and how to use the 1.0, 1.272 and 1.618 targets.