Crab and Deep Crab: Extreme Reversal at 1.618 and 0.886
The Crab completes at 1.618 of XA and the Deep Crab at 0.886 of XA with a 1.618 BC extension, producing the tightest stops and highest reward of any harmonic but the lowest win rate.
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Crab and Deep Crab: Extreme Reversal at 1.618 and 0.886
The Crab is the harmonic for traders who would rather win 45 percent of the time at 1:5 than 65 percent at 1:2. It is a pure reward-for-accuracy trade.
The Crab is the most extreme of the standard harmonic patterns. Its defining ratio — D at 1.618 of XA — places the completion far beyond the X point, where the prior move has fully exhausted. The Deep Crab variant pushes the BC leg to a 1.618 extension while keeping AD at 0.886 of XA, producing a different risk profile.
Standard Crab structure
- AB = 0.382–0.618 of XA
- BC = 0.382–0.886 of AB
- CD = 2.24–3.618 of BC
- XD = 1.618 of XA — the defining ratio
The Crab's AB is shallow (0.382–0.618), leaving room for the long CD extension to reach 1.618 of XA. If AB retraces 0.786 or deeper, the geometry cannot produce a valid Crab.
Deep Crab structure
- AB = 0.886 of XA (deeper than standard)
- BC = 0.382–0.886 of AB
- CD = 1.618 of BC (the defining extension)
- AD = 0.886 of XA (not 1.618)
The Deep Crab completes inside the XA range at 0.886, but its CD leg is forced to the 1.618 extension. Both patterns share the "extreme CD" character but land at different price levels.
Why win rate drops but reward rises
| Property | Standard Crab | Deep Crab |
|---|---|---|
| XD completion | 1.618 of XA | 0.886 of XA |
| CD extension | 2.24–3.618 of BC | 1.618 of BC |
| Win rate | ~46% | ~51% |
| Stop distance | 0.20 × ATR beyond D | 0.25 × ATR beyond D |
| Reward to T2 | ~5.0 × risk | ~4.0 × risk |
| Best context | Extended trend exhaustion | Deep pullback in trend |
Backtested on daily equity index data, the standard Crab wins ~45–48%, the Deep Crab ~50–52%. Both pay 1:4 to 1:6 at the standard target. Expectancy is comparable to the Gartley (~0.3R) but arrives through fewer, larger wins — suiting accounts that can tolerate drawdown strings of four to six losses between wins.
The trade plan
- Entry: at D, on a reversal bar. Both patterns require confirmation — never pre-position.
- Stop: 0.20 × ATR (Crab) or 0.25 × ATR (Deep Crab) beyond D.
- Target 1: 0.382 of CD. Scale 30%. Move stop to break-even.
- Target 2: 0.618 of CD. Scale 40%.
- Target 3: point A. Scale 30%, or trail with a 3 × ATR stop.
The Crab's long CD makes the 0.382 and 0.618 retracements large moves in absolute terms — the source of the high reward.
Worked standard Crab
Bearish Crab: X = 4,000, A = 4,200 (XA = 200 up). AB retraces to 4,076 (0.618). BC rallies to 4,166 (0.618 of AB). CD extends above A to D = 4,200 + (200 × 1.618) = 4,523.60.
Entry at 4,523.60 on reversal bar. ATR = 40, stop at 4,523.60 + (0.20 × 40) = 4,531.60. Risk = 8 points. CD = 357.60. Target 1: 4,523.60 − (0.382 × 357.60) = 4,387. Target 2: 4,523.60 − (0.618 × 357.60) = 4,302.61. Reward to target 2 = 220.99. Risk-reward ≈ 1:27 at target 2 — the Crab's signature payoff, and the reason the low win rate is tolerable.
When the Crab fails
The Crab fails most often when CD extends beyond 1.618 of XA — entering at 1.618 then catches a continuation. Invalidation rule: if price closes more than 0.5 × ATR beyond the projected D before any reversal bar, cancel the trade. The extension has become trend, not exhaustion.
The Crab is for traders who can sit through five losses to take one 1:5 winner and end the month positive. Match the pattern to your psychology, not the other way around.
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