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Projecting the London Session From the Asian Range

The Asian session on GBP/USD produced a range between 1.2700 and 1.2730, 30 pips wide. You plan to trade a breakout at the London open with a buy stop and a sell stop outside the range.

Set the orders with a 3-pip buffer: buy stop at 1.2733, sell stop at 1.2697.

For the long, choose a stop at the middle of the range, 1.2715, risking 18 pips. A target equal to one range width, 30 pips, gives 1.2763. Ratio 30 divided by 18, which is 1.67.

For the short, the mirror: entry 1.2697, stop 1.2715, target 1.2667.

Probability matters. In a simple version of this strategy, many breakouts fail, and the win rate might be 40 to 45 percent. At a ratio of 1.67, the break-even win rate is 18 divided by 48, which is 37.5 percent. So a 42 percent win rate gives a small positive edge. A 35 percent rate loses.

Add filters. Skip days when the Asian range is under 15 pips or over 50. Skip days with a major data release in the first hour. Trade only in the direction of the daily trend.

Costs: GBP/USD spreads at the London open are usually tight, but they widen briefly around the open itself.

The test is simple: record the Asian range, the breakout direction, and the result over forty days.

Try this: collect the Asian range for twenty days and note how often the first breakout held.

Asian hours get a reputation as the calm time for range trading. EURUSD in particular often drifts inside a 15 to 25 pip box. Looks perfect for scalping mean reversion.

The catch is what the box is made of. Volume is thin, so each move is driven by a few orders rather than a crowd. Price pokes out of the range, finds nothing, and snaps back, which feels like a gift. Then occasionally a single larger order pushes through and keeps going, and the fade ends up on the wrong side of a run.

Spreads are wider than in London, and the cost per trade is a bigger part of a small range. A 5 pip target in a market with a 1 pip effective spread is a different bet than the same target in a market with 0.2.

Another thing that gets ignored: Asian-session EURUSD is mostly driven by flow from Asian names in other pairs. EURUSD follows, it doesn't lead. Looking at USDJPY and AUDUSD gives clues about what's coming.

The range is real, but the edge tends to be thinner than it looks, and the tail risk is fatter.

Another habit that helps is separating the Asian session into halves. The first half, roughly Tokyo's morning, carries real flow from Japanese corporates and the fix. The second half, after Tokyo lunch and into the London pre-open, is thinner and gets pushed around more easily. Range behavior in those halves differs, and lumping them together hides it.

A decent approach is measuring how often the Asian range gets broken during London, and by how much. On many pairs, the Asian high or low gets run in the first hour of London more often than not. That means resting a fade right at the Asian extreme has already been priced in by plenty of other participants, and the actual setup tends to come after the sweep rather than before it.

Is EURUSD worth trading at all during Asian hours, or is it better to just watch USDJPY and AUDUSD?