5-0 pattern: Carney’s ratios and two D measurements

Scott Carney’s 5-0 describes a measured price structure with D referenced to half of BC and a reciprocal AB=CD projection. Classifying its geometry does not prove an imminent reversal or a profitable trade. Record the points, calculate the lengths and evaluate any separate trading rules independently.

What the 5-0 pattern is and where it came from

Carney presents 5-0 in Harmonic Trading: Volume Two, using X, A, B, C and D with an earlier point 0. He associates it with a first pullback after a significant directional change. In his bullish construction, a decline from 0 to X is followed by a bounce to A, B below X, a rally to C and a pullback toward D. That describes the ordered price structure, not the probability of the next move.

Understand this formation as part of a larger family. If you are just starting out, work through the basics of trading harmonic patterns first — they all rest on the same logic of Fibonacci relationships between swings.

Structure and Fibonacci levels

Measure absolute price differences after fixing the points in chronological order. In the cited bullish 5-0 definition, AB/XA lies from 1.13 to 1.618 and BC/AB from 1.618 to 2.24. The latter extension is a classification condition; it does not demonstrate that the market has made a predictable error or must reverse.

Calculate two levels separately: half the BC length back from C and an equal AB length projected from C toward D. The midpoint is the primary D reference; reciprocal AB=CD helps describe the potential reaction area. With AB length L and q = BC/AB, the distance between these levels is |0.5q − 1| × L. They coincide only when q = 2. For hypothetical AB = 150 pips, q values 1.618, 2.000 and 2.240 give gaps 28.65, zero and 18 pips. Those valid ratios do not guarantee a narrow single level. A separate chosen maximum-gap filter of 10 pips would accept only the middle variant; it is our example rule, not an author requirement. The Fibonacci extension guide explains projection tools.

How to recognise the formation step by step

Step 1 — find the reversal and the X-A leg

Start with context: you want a market that has just changed direction after a longer move. Point X is the start of the first leg against the trend, and point A is where it ends. Without a trend that has broken down, this is not a 5-0 setup.

Step 2 — measure the A-B and B-C extensions

Check that the A-B leg ends point B inside the 1.13-to-1.618 band of the XA leg, then that the B-C leg gives a deep extension between 1.618 and 2.24 of the AB leg. That excess C wave is the heart of the formation. A shallow C wave, or a point B that runs too far, disqualifies the setup.

Step 3 — locate point D at 50 percent of the B-C leg

From C, compute half BC and the reciprocal AB projection independently, including their difference. Record how and when pivots become fixed, plus any tolerance chosen before testing. A later candle or a complete hindsight chart must not silently redefine earlier points. Reaching a computed level is not proof of an executable order or a completed trade.

Entry, stop and targets — a hypothetical example

Keep the table’s hypothetical coordinates, not a historical EUR/USD trade. The 61.8% BC reference is 1.1170 − 0.618 × 0.0320 = 1.097224. In a separate illustrative plan, assume a filled purchase at 1.1015 and an ordinary stop requested at 1.0960. The planned difference is 55 pips. These entry and exit rules are assumptions: a reversal candle is an optional tested condition, and the pattern definition alone does not prescribe or guarantee the stop fill.

For the hypothetical C = 1.1170 and geometric D = 1.1010, a 61.8% recovery of CD gives 1.1010 + 0.618 × 0.0160 = 1.110888. Relative to the assumed purchase 1.1015, the target difference is 93.88 pips, about 94 when rounded, versus 55 planned risk pips. The reward:risk convention therefore gives about 1.71:1 before costs. A target at C gives 155 pips, about 2.82:1. These describe assigned price distances, not a guaranteed payoff or actual outcome; spread, fees, financing and adverse fills must be included separately.

The most common mistakes when trading the 5-0

1. Entering at point C instead of point D — confusing the 5-0 with the Shark and entering one leg too early.
2. Accepting a B-C leg that is too shallow, below the 1.618 extension — without that excess wave there is no 5-0.
3. Skipping the reciprocal AB=CD confirmation and relying solely on the 50 percent level of the BC leg.
4. Treating a geometric D level or a 61.8% management reference as a guaranteed loss limit. Specify the tested exit separately; ordinary-stop execution may differ from its request.
5. Trading with no reversal context — the 5-0 is the first pullback after a change of direction, not a consolidation play.

How the 5-0 differs from other harmonic patterns

The relevant difference is the measured reference leg. In Carney’s Gartley and Bat definitions, the D references use XA retracements 0.786 and 0.886 (see the Gartley and Bat discussion). For 5-0, the midpoint reference is BC. Pattern classification does not itself prescribe an executable entry.

The Shark pattern supplies a related precursor structure in Carney’s terminology. The AB=CD explanation develops equal-length projections. Compare their reference legs and labeling; these links do not prove that the same trade rule works for each.

Who this pattern is for

Check your ability to label pivots consistently without later data, rather than assigning a universal beginner rating or rarity rank. The technical-analysis overview provides context, and Fibonacci retracements explain the measurements. Record rejected candidates as well as matching ones. A demonstration of the definition is not a measured success rate.

What to do tomorrow to start learning the 5-0 pattern

1. Open TradingView on EUR/USD in the hourly timeframe and review recent clear trend reversals, marking points X-A-B-C in turn — this trains you to see the formation's context before any tradable entry signal appears.
2. On each candidate, use the Fibonacci tool to check two things at once: whether the B-C leg sits in the 1.618-to-2.24 band of the AB leg, and whether the retracement to point D lands at 50 percent of the BC leg.
3. Set up a simple journal with columns for the leg ratios, the entry location, the stop-loss level and the achieved risk-to-reward, then fill it in after every demo trade so you can see what actually works for you.
4. Place a price alert at the 50 percent level of the BC leg on a pair you are watching — when price reaches the D zone you can calmly judge whether a confirming reversal candle is forming, or skip the trade.
5. Keep a fixed-rule record of accepted and rejected candidates, fills, costs and adverse outcomes. Evaluate a separate subsequent period without changing the earlier rules; twenty demo trades or a high win percentage alone establishes neither live readiness nor future profitability.