The first move after the open is supposed to be a deliberate fake. It reverses roughly forty-five times in a hundred, which is memorable — and it continues the other fifty-five, which is not.
A Judas swing is a false move at a session open that traps traders before price travels properly the other way — and it happens slightly less often than the opening move simply continuing.
The idea is that the first move after a session opens is a deliberate fake. Price pushes one way, drags in the traders who chase it, takes their stops, and then travels properly in the other direction for the rest of the session.
It is a compelling story and it has a memorable name. It also makes a very specific, very testable prediction: the first move after the open should reverse more often than it continues.
Someone tells you that when a football match kicks off, the team that scores first usually loses. That is a clear claim with a clear test — count the matches.
What you must not do is remember the times it happened. Dramatic reversals are memorable precisely because they are dramatic; ordinary matches where the first scorer went on to win do not stick in the mind. Counting is the only way past that, and it is what this page does.
| Instrument | London: reversed | London: continued | NY: reversed | NY: continued | Sessions |
|---|---|---|---|---|---|
| XAUUSD | 45.3% | 54.7% | 45.1% | 54.9% | 2,436 |
| GBPUSD | 43.4% | 56.6% | 46.1% | 53.9% | 2,397 |
| EURUSD | 41.2% | 58.8% | 45.7% | 54.3% | 2,419 |
| US30 | 48.9% | 51.1% | 44% | 56% | 1,772 |
| NAS100 | 48.6% | 51.4% | 45% | 55% | 1,782 |
What was counted: At the 07:00 UTC London open and the 12:00 UTC New York open, the first hourly candle's direction is taken as the initial move, ignoring hours whose body is under 15% of their range. Reversal means price then travelled one full first-hour range past the opening price in the opposite direction; continuation means it extended the first hour's own extreme by the same amount. Whichever came first wins, and bars reaching both are discarded.
The first move after the open continued more often than it reversed. At both opens. On all five instruments. There is no exception in the table.
The margin is small — this is close to a coin flip either way — but it points the opposite direction to the claim. A trader who systematically faded the first move after the open would have been on the wrong side slightly more often than not, before costs.
Because Judas swings are real. They happen. Roughly forty-five times in a hundred, price does push one way at the open and then reverse hard — and when it does, it is dramatic, expensive if you were caught, and extremely memorable.
What is not memorable is the fifty-five times in a hundred when the opening move simply carried on and the session was unremarkable. Nobody makes a video about those. This is the same survivorship problem that keeps the "levels get stronger with testing" myth alive, and it is the single most common reason a trading idea outlives the evidence against it.
Marcus has read that the London open is a trap. His plan is to wait for the first hour, then take the opposite direction.
What happens on Monday. Gold pushes up in the 07:00 hour. He shorts at 08:00, expecting the Judas swing. Price keeps going up and stops him out.
What happens on Tuesday. Same setup. This time price reverses hard and he makes three times his risk. He concludes the strategy works and that Monday was noise.
What the numbers say about the plan. Across 1,216 London opens on gold, the first move reversed 45.3% of the time and continued 54.7%. Marcus is not trading an edge — he is trading a slightly-worse-than-coin-flip with a memorable name attached, and Tuesday's win is what will keep him doing it.
What he should take from it. Not that the open is meaningless — the New York window really does contain most of the day's range, as the killzone lesson shows. Just that the direction of the first move carries no usable information, and building a system on it means paying the spread at the widest moment of the day for nothing.
Marcus's problem is that his sample was one loss and one win. Replay six months of session opens, take the fade every single time with rules fixed in advance, and count. That is the only way to tell an edge from a story you happen to remember.
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What is a Judas swing?
A move at a session open said to be deliberately false — price pushes one way, traps the traders who chase it, then travels properly in the other direction. The name refers to the betrayal.
Does the Judas swing actually happen?
It happens, but not more often than the alternative. Across 1,216 London opens on gold, the first move reversed 45.3% of the time and continued 54.7%. The New York open gave the same answer, and so did all five instruments. Reversals are real; they are just not the majority case.
Why does everyone believe in it then?
Because when it happens it is dramatic and expensive, and the sessions where the opening move quietly continued are forgettable. That is the same survivorship bias that keeps "levels get stronger with testing" alive — the memorable cases are not a random sample of all cases.
Should I fade the first move after the open?
The measurement says no. The tilt is slightly against you before costs, and the spread at a session open is at its widest. If anything the data supports the dull option: wait for the first hour to finish and let structure form.
Does this mean session opens do not matter?
Not at all. The New York window carries most of the day's range and holds the daily extreme at about twice chance — see the killzone lesson. What this page tests is narrower: whether the direction of the first move tells you anything. It does not.
How was reversal defined?
Symmetrically, so neither outcome is favoured. Reversal means price travelled one full first-hour range past the opening price in the opposite direction; continuation means it extended the first hour's own extreme by the same amount. Whichever happened first won, and hours reaching both were discarded.
Replay six months of session opens, apply the fade every single time with rules fixed in advance, and total the result. Your memory of this pattern is biased toward the exciting outcome; a tally is not.
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This page focuses on “The Judas Swing”.The claim that the first move after the open is a fake, measured across 10,806 session opens. It continued 54.7% of the time at the London open and reversed 45.3% — the opposite of the claim, on every instrument.For “The Judas Swing”, a beginner should identify what the learning guide measures, assumes or teaches before acting on its conclusion.Treat this page's account of “The Judas Swing” as a learning reference rather than a prediction, signal or promise of future performance.
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