What is an ABCD pattern?

An ABCD pattern uses four alternating swing points and three price legs. AB and CD move in the same direction, separated by the BC retracement. A completed shape is not itself proof of a reversal.

What is the formula for the equal-leg D price?

Use D = C + (B - A) on linear prices. For A = 120, B = 100 and C = 112.36, the projected D is 92.36. This calculation projects a price; it does not confirm a swing or an entry.

Must AB and CD take the same time?

Time equality is part of the AB=CD description in the TradingView drawing guide. A practical rule should state whether it requires exact equality or a preset tolerance, and whether time means bars or elapsed time. Other ABCD variants need their own time rule.

Can I enter at D before a pivot is confirmed?

You can define a projected-zone rule, but it cannot rely on a future confirmed D pivot. If the method needs three right-hand bars, its confirmed-pivot entry must wait for those bars. Test the two approaches separately.

Is ABCD the same as XABCD?

No. XABCD adds a fifth point and relationships involving the XA leg. The Pineify Harmonic Pattern Calculator uses XABC inputs for supported harmonic definitions; it is not a general detector for every four-point ABCD setup.

What invalidates an ABCD pattern?

Invalidation depends on the declared version and tolerance. A C point beyond A, a CD leg outside the accepted ratio, or an expired time window can reject a candidate. After entry, a failed reversal is recorded through the original stop or exit rule rather than erased from the test.

Is there a reliable ABCD pattern win rate?

There is no single win rate implied by the pattern name. Results depend on swing selection, confirmation timing, market, exits, sample and costs. Any reported rate needs those definitions and an independently held-out test period.

Chart pattern guide

ABCD pattern: ratios, timing and confirmation

An ABCD pattern connects four alternating swing points with three legs: AB, BC and CD. In the equal-leg version, CD repeats the price distance of AB after the BC retracement. D marks a possible completion area; a reversal trade still needs a separate confirmation and a failure rule.

See the decision guide

Choose four points in time order

For a bullish reversal hypothesis, A is a high, B a low, C a lower high and D a lower low. The bearish version reverses those directions. Use the same timeframe, session and price source throughout. Wick extremes and closing prices can produce different measurements, so specify which one defines your points.

Require A, B, C and D to occur on increasing bar indices; do not reuse one bar for two points
Define how to handle equal highs or lows and a newer, more extreme pivot before coding
Cancel an unfinished bullish candidate if price breaks above A; reverse the condition for a bearish candidate
Keep the last unconfirmed swing provisional instead of rewriting earlier trades after it moves

Point	Bullish reversal candidate	Selection constraint
A	Starting swing high	Use a fixed pivot or reversal-threshold rule
B	Swing low below A	Measure AB only after B is confirmed
C	Retracement high between B and A	Freeze the candidate once C is confirmed
D	Completion low below B	Distinguish a projected price from a confirmed swing

AB=CD, classic ABCD and extensions use different ratios

TradingView distinguishes three versions in its drawing-tool documentation. Pick the version before measuring. For the formulas below, L_AB = |B - A|, L_BC = |C - B| and L_CD = |D - C| are absolute price distances, not the visual lengths of lines on a screen.

Equal-leg projection: D = C + (B - A). The signed AB move is repeated from C
Retracement ratio: r = L_BC / L_AB. If CD equals AB, its BC extension is 1 / r
A 0.618 retracement therefore pairs with about 1.618 of BC; a 0.786 retracement pairs with about 1.272
Carney describes C retracements from 0.382 to 0.886 for his AB=CD framework. State the framework instead of mixing its range with an unrelated pattern definition

Version	Price relationship	Time relationship
AB=CD	L_CD / L_AB = 1	TradingView describes equal AB and CD duration
Classic ABCD	L_CD / L_BC = 1.272 or 1.618	Specify any time filter separately
ABCD extension	L_CD / L_AB = 1.272 or 1.618	Specify any time filter separately

Keep exact definitions separate from tolerances

Exact equality is a reference value. A detector needs an explicit acceptance interval. The following bullish example is hypothetical, uses linear price differences and measures duration in chart bars. The tolerances are illustrative testing choices, not established settings or evidence of profitability.

Price agreement does not imply time agreement; report both ratios
Choose chart-bar count or elapsed clock time. Sessions, weekends and missing bars make them different measurements
Record tolerance units: a 5% leg-length error differs from five percentage points of retracement
If the price zone is reached after the time window, reject it under this rule rather than widening the window afterward

Measurement	Hypothetical values	Result
Observed points	A = 120, B = 100, C = 112.36	AB = 20; BC = 12.36; retracement = 0.618
Equal-leg completion	D = 112.36 + (100 - 120)	D = 92.36; CD = 20
Price tolerance	\|L_CD / L_AB - 1\| ≤ 0.05	CD from 19 to 21; D from 91.36 to 93.36
Time symmetry	A at bar 10, B at 20, C at 26	AB takes 10 bars; exact time match puts D at bar 36
Time tolerance	0.8 ≤ duration_CD / duration_AB ≤ 1.2	CD takes 8 to 12 bars; D at bars 34 to 38

A D label can appear before the trade was knowable

A pivot method that needs three bars to the right can confirm a D low at bar 36 only after bar 39 has closed. Drawing the label back on bar 36 does not make the signal available there. Keep the swing bar, detection bar, confirmation bar and order fill as separate timestamps. TradingView documents this past-plotting issue in its repainting guide.

If entry requires a confirmed D pivot, evaluate it no earlier than the pivot confirmation
A projected-zone entry can occur earlier, but it is a different rule that does not yet know the final D swing
If confirmation requires a close above a particular high after D, define that high and the maximum wait in advance
Use actual strategy fill timestamps: TradingView market orders normally fill on the next available tick, often the next bar open under default settings

Incomplete structure and failed reversal are different outcomes

An ABCD label describes geometry. It does not establish a trade result. In the hypothetical bullish example, separate the states below so an unfinished candidate is not counted as a completed trade and a losing trade is not removed by relabeling the pattern.

A sample test could cancel a bullish candidate below 91.36 and require a close above the confirmed D-bar high within five bars of confirmation
If testing that sample, specify the stop, target and position risk before entry; a zone boundary alone is not a complete exit policy
A gap through a stop can produce a worse fill than the stop price. Model costs and inspect the order assumptions

State	What happened	How to record it
Incomplete	A, B and C are known; price has not reached the D zone	Candidate only; no completed D or reversal entry
Completed, unconfirmed	Price reaches the allowed zone but the entry trigger never occurs	No trade; expire it at the written deadline
Invalidated before entry	Price crosses the preset cancellation boundary before confirmation	Canceled candidate; keep it in the detection audit
Failed reversal	An eligible entry occurs, then its stop or time exit closes the trade	Retain the loss and all trading costs
Extension	CD runs beyond the equal-leg tolerance	Reject the equal-leg setup; assess an extension only under a separately declared rule

Turn the measurements into an auditable TradingView test

For ABCD pattern trading, give the Pine Script AI Coding Agent the pivot method, allowed ratios, tolerances, expiry and trade rules. Ask for separate markers for the swing and the time it became known. Review the generated source and compile it in TradingView before evaluating a strategy on standard price candles.

Keep a later period out of parameter selection; report candidate count as well as executed trades
Export the TradingView trade list and use Backtest Report to inspect the recorded entries, exits, drawdown and trade distribution
Compare exported entry times with the confirmation markers yourself. A report of trades cannot prove that the original signal avoided future information
For five-point XABCD work, the Harmonic Pattern Calculator accepts XABC prices and calculates candidate D zones. It does not select ABCD swings or scan live charts

Where Pineify fits

Pine Script AI Coding Agent

Turn your written point-selection and ratio rules into editable Pine Script. Specify the confirmation delay and review the generated logic before testing it in TradingView.

Also useful: Backtest Report. Analyze exported TradingView trades, then compare their entry times with your signal-confirmation record. Imported results cannot verify the original point-selection logic.

Build the ABCD rules

Related resources

TradingView chart pattern guides Measure XABCD harmonic ratios Build the rule in Pine Script Review exported strategy trades

Frequently asked questions

Educational information only, not investment advice. The price, tolerance and entry examples are hypothetical and have no demonstrated trading performance. Patterns can fail, and historical or simulated results do not guarantee future returns.

Sources and verification

Last verified: 2026-10-16