Pattern Detail

Crab

The deepest extension in the family, completing at a 1.618 projection, built for sharp reversals from overshoots.

X A B C D
  • B = 0.382-0.618 of XA
  • C = 0.382-0.886 of AB
  • D = 2.618-3.618 of BC
  • D = 1.618 of XA
Idealized bullish Crab. It completes at a low and projects a move up.

Bullish Crab

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How to read this

Everything here is in R, the setup's own risk. 1R is the distance from the entry (the pattern's closing price) to where it would be proven wrong — its lowest low over the 4 bars that form it. So "offered 2R" means price ran twice that distance in your favor at some point before the stop. It does not assume you took profit there: a target is a strategy choice.

Room offered (≥ 1R)

0.0%

Too few to trust

Offered at least 1× its risk before the stop, vs 44.1% for a random long entry (-44.1 pts).

Move size vs normal

1.22×

Realized range over the next 20 bars vs a random bar. Precedes a bigger move.

Typical room (20-bar)

0.42R

Average run in favor (capped at 3R), vs 1.16R for a random long entry.

Summary

Offered ≥1R 0.0% of the time vs 44.1% for a random long entry. The 44.1-point gap is no bigger than the ±68.8-point margin of error you would get by chance from 2 occurrences. Not a reliable edge.

Room offered, this setup vs a random long entry

Only 2 occurrences. The breakdown below is shown in full, but a sample this small is anecdotal, a hint, not a measured edge. That is usually a limit of available history, not a flaw in the pattern. For a firmer read, try a lower timeframe or a more active instrument.

Outcome This setup Random entry Edge
Offered ≥ 1R 0.0% 44.1% -44.1
Offered ≥ 2R 0.0% 24.7% -24.7
Offered ≥ 3R 0.0% 15.7% -15.7
Stopped < 1R 50.0% 42.7% +7.3
Went sideways 50.0% 13.2% +36.8

2 occurrences · 10,656 random-entry controls · 20-bar horizon

Bearish Crab

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How to read this

Everything here is in R, the setup's own risk. 1R is the distance from the entry (the pattern's closing price) to where it would be proven wrong — its highest high over the 4 bars that form it. So "offered 2R" means price ran twice that distance in your favor at some point before the stop. It does not assume you took profit there: a target is a strategy choice.

Room offered (≥ 1R)

66.7%

Too few to trust

Offered at least 1× its risk before the stop, vs 43.0% for a random short entry (+23.6 pts).

Move size vs normal

0.72×

Realized range over the next 20 bars vs a random bar. Precedes a quieter stretch.

Typical room (20-bar)

1.76R

Average run in favor (capped at 3R), vs 1.16R for a random short entry.

Summary

Offered ≥1R 66.7% of the time vs 43.0% for a random short entry. The 23.6-point gap is no bigger than the ±32.3-point margin of error you would get by chance from 9 occurrences. Not a reliable edge.

Room offered, this setup vs a random short entry

Only 9 occurrences. The breakdown below is shown in full, but a sample this small is anecdotal, a hint, not a measured edge. That is usually a limit of available history, not a flaw in the pattern. For a firmer read, try a lower timeframe or a more active instrument.

Outcome This setup Random entry Edge
Offered ≥ 1R 66.7% 43.0% +23.6
Offered ≥ 2R 55.6% 25.9% +29.7
Offered ≥ 3R 22.2% 17.0% +5.2
Stopped < 1R 33.3% 47.1% -13.8
Went sideways 0.0% 9.9% -9.9

9 occurrences · 10,573 random-entry controls · 20-bar horizon

The Crab, another of Scott Carney’s patterns, is the most extended structure in the harmonic family, a five-point shape from X to A to B to C to D. The signature is the completion: D extends to 1.618 of the whole X-to-A leg, reached through a very long C-to-D projection, a deep overshoot far beyond the origin before the turn.

How to spot it

  • A clear X-to-A leg, then a B point that retraces a moderate 0.382 to 0.618 of XA.
  • C retraces 0.382 to 0.886 of AB, and D projects a very long 2.618 to 3.618 of BC.
  • D extends to 1.618 of XA, well past the origin X. All four ratios hold at once.
  • The structure completes at D, a swing low in an uptrend (a buy) or a swing high in a downtrend (a sell).

The chart above marks the X, A, B, C, D points on a real occurrence, with the ratio of each leg.

Why it matters

A Crab completes beyond its origin, not inside it. The C-to-D leg stretches price well past where the move began, so D marks an overshoot rather than a measured pullback. It is read as a level to fade: the point where a stretched move exhausts and snaps back. The far-away completion gives a precise level to fade, and the reversal from a true Crab can be the sharpest of any harmonic pattern.

That places it among the extension harmonics, alongside the Butterfly, where D pushes past the origin. The retracement harmonics, the Gartley and Bat, are the opposite case: their completion sits inside the prior move, so they buy a dip rather than fade an overshoot. The Crab is the most extended member of the family, and that reach is also its risk. It asks a trade to fade an already-violent move, which is exactly when trends can keep accelerating, so a Crab that does not turn leaves the trade short a runaway rally or long a falling knife.

The honest question is not whether the shape can be drawn on a chart, it always can after the fact, but whether a completion actually leads anywhere. That is what the data below measures.

Does it actually work?

A pattern is a setup, not a trade, so the question is not “did it win” but “how much room did the move offer before the structure was proven wrong.” The tabs below answer that across five futures markets (Nasdaq, S&P 500, gold, crude oil, natural gas) and seven timeframes from one minute to one day.

For each completion we measure the room price offered in units of the pattern’s own risk, then set it against what a random swing pivot of the same kind would have done. A Crab that turns up from a swing low is judged against ordinary swing lows; one that turns down from a swing high, against ordinary swing highs. When the completion offers more room more often than those random swings, that shows up as a real edge. When it does not, the page says so plainly.

Harmonic structures are rare, so read the sample size in view. On the slower timeframes a Crab completes only single digits of times, or not at all, while the faster timeframes give a larger sample. Thin samples are flagged for you.

How we measured it

  • Entry is the close of the bar that confirms the D point, the earliest a trader could act without hindsight.
  • One unit of risk, 1R, is the distance from that close to D itself, the swing extreme the structure completes at. A move back through D says the pattern has failed.
  • We follow the next 20 bars and record how far price ran in your favor, in multiples of that risk, before D gave way.
  • The comparison is a random swing pivot of the same side, which already sits at a turning point with a tight stop. That keeps it apples-to-apples: the question is whether a Crab swing runs further than an ordinary swing of the same shape, not whether a tight stop flatters the numbers.

What this page does not cover

  • A profit target. Harmonic tradition puts one at a Fibonacci retracement, but where you take profit is a strategy choice, so this measures only the room the structure tends to offer.
  • A trend filter, or confluence with support, resistance, or a higher-timeframe level, which traders normally use to weight a completion.
  • A guarantee. A valid shape on the chart is a setup, not a certainty. What it tends to do next is exactly what the numbers above describe.

FAQ

Do harmonic patterns like the Crab actually work?

Harmonic patterns are described everywhere but rarely tested honestly. This page scores every completed Crab by the room it offered in units of its own risk, measured against random swing pivots of the same kind, and counts a pattern only on the bar its final pivot confirms, so nothing is read in hindsight. The result is a like-for-like comparison rather than the round-number success rates usually quoted for harmonics.

What is the Crab pattern success rate?

There is no single reliable figure, and the often-cited round-number rates rarely specify instrument, timeframe, or test period, and almost never state what target and stop they assume. Rather than quote folklore, this page measures how far a completion runs in units of its own risk and whether that beats an ordinary swing of the same shape. The Crab is one of the rarer structures, so read that comparison alongside the count shown for each market and timeframe.

How is the Crab defined here?

It is a five-point XABCD structure where B retraces 0.382 to 0.618 of XA, C retraces 0.382 to 0.886 of AB, D projects 2.618 to 3.618 of BC, and D extends to 1.618 of XA, all holding at once within a 5% tolerance. Pivots use 3 bars on each side and are confirmed before they count.

Sample Crab Completions (10)

Based on data through Apr 29, 2026

Time Direction Risk (pts) Room offered Result
Jan 26, 2026 Bearish 45.25 1.12R Ran ≥1R
Jan 31, 2025 Bearish 63 3.00R Ran ≥1R
May 9, 2022 Bullish 140.25 0.21R Stopped
Dec 18, 2019 Bearish 7.75 2.77R Ran ≥1R
Sep 20, 2018 Bearish 20 0.23R Stopped
May 8, 2017 Bearish 10.5 0.67R Stopped
Nov 17, 2015 Bearish 13.75 2.24R Ran ≥1R
Jun 26, 2013 Bearish 9 0.64R Stopped
Dec 3, 2012 Bearish 7.25 3.00R Ran ≥1R
Jul 13, 2010 Bearish 4 2.19R Ran ≥1R

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