5-0 pattern strategy — Carney Shark hybrid harmonic reversal

The 5-0 is one of the youngest and most unusual harmonic formations described by Scott Carney. Its name has nothing to do with a formula — the five-point structure simply resembles the digits "5" and "0" drawn on a chart. It is a niche pattern, meant to flag the first pullback after a clear trend reversal, and it demands real discipline in your Fibonacci measurements. Below I explain how to recognise it and how to trade it.

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

The 5-0 is a five-point reversal formation labelled X-A-B-C-D, which Scott Carney described in the second volume of his harmonic trading series. Unlike the rigid Gartley or Bat, it allows a wider band of extensions and leans on one measurement in the entry zone. Carney treats it as the signal of a "first pullback" after the market changes direction — so it usually appears once a strong trend has just broken down.

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

"Harmonic patterns identify price relationships using Fibonacci ratio analysis to define precise turning points in the market." — Scott M. Carney, Harmonic Trading, Volume One, Pearson, 2010

The formation is made of five points joined by four legs: X-A, A-B, B-C and C-D. The X-A leg is a reaction against the prior trend. The A-B leg is a reversal impulse and defines point B at an extension that, according to Carney, should not exceed 1.618 of the XA leg. Then comes the decisive B-C leg: a deep extension of at least 1.618 but no more than 2.24 of the AB leg. This excess C wave gives the pattern its character — the market overshoots.

The final segment, the C-D leg, retraces to exactly 50 percent of the B-C leg. Point D at that level is the potential reversal zone and the place to enter. Carney adds one condition: a reciprocal AB=CD should complete at point D, an equality of leg lengths measured "from the end". When both measurements coincide, the signal is strong. To locate them you use the same tools as for Fibonacci extensions when projecting targets.

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 within 1.618 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

The C-D retracement should halt at the midpoint of the B-C leg. There, check whether a reciprocal AB=CD completes. The convergence of both measurements marks the potential reversal zone — and that is your entry point, not the earlier point C.

Entry, stop and targets — a hypothetical example

Take the setup from the table above. Once point D completes around 1.0955, do not enter blindly at the Fibonacci level — wait for confirmation from price: a reversal candle, a hammer, or a bullish engulfing in the D zone, and only then open the long. The stop goes just beyond point C, slightly below 1.0780: if the market breaks the C extreme, the structure falls apart, so that is the natural invalidation level.

Set targets conservatively: the first take profit is the 38.2 percent retracement of the A-D leg, the second around 61.8 percent. With small risk below point C, the realistic risk-to-reward ratio usually lands near one to two. Remember, though: the figures above are illustrative and show the logic, not a forecast.

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. Setting the stop too tight, right at point D — the reversal zone is often tested by wicks, so the stop belongs at point C.
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 most important difference is where you enter. The classical Gartley and Bat end with an entry at point D on a retracement of the XA leg, at 0.786 and 0.886 respectively (you can follow those ratios in the guide to the Gartley and Bat patterns). In the 5-0, point D refers not to the XA leg but to the midpoint of the BC leg.

The Shark pattern, in turn, shares the 5-0's deep extensions but enters earlier, at point C — the 5-0 is effectively its extension. The reciprocal AB=CD element ties it to the logic of leg equality, which the AB=CD pattern explains.

Who this pattern is for

Let us be honest: the 5-0 is not a beginner's formation. It is one of the rarest harmonic patterns, hard to identify in real time, and on a historical chart it is easy to convince yourself it "fits" when the ratios are being stretched. Before you reach for it, get a solid grip on support and resistance, on price action, and on the broader technical analysis behind these tools. Plain Fibonacci retracements are another good foundation — without reading those levels fluently, the measurements in the 5-0 are just guesswork. Treat it as a complementary tool, not a standalone system.

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. Complete at least twenty demo trades using the 5-0 exclusively and document each one with its result — only a repeatable success rate on this niche formation justifies moving it to a live account.