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Trendlines, How to Draw Them Without Fooling Yourself

Trendlines look easy, but they are one of the most subjective tools in trading. Two traders can draw different lines on the same chart and both feel certain. Here is a disciplined method.

1. Use enough data. Zoom out to see a meaningful trend, not just a few candles.

2. Anchor on clear swing points. For an uptrend line, connect at least two swing lows. For a downtrend line, connect swing highs.

3. Confirm with a third touch. A line with only two points is a hypothesis. A third touch makes it more credible.

4. Don't force the line. If you have to ignore many candles to fit it, it isn't a good line.

5. Use wicks or bodies consistently. Pick one approach and stick to it.

6. Watch the angle. Very steep lines break easily. Moderate slopes tend to last longer.

How to trade them:

- Look for bounces off the line in the trend direction
- Treat a close through the line as an early warning, not a guaranteed reversal
- Combine the line with structure and liquidity; trendlines attract stops too

Common mistakes:

- Redrawing the line after every candle
- Treating it as an exact price
- Trading every touch

Remember that a trendline is a zone of interest. Price can wick through it and still respect it.

Draw lines for a purpose, not for decoration.

I only draw a trendline after two confirmed swings on the same timeframe I will trade. Connecting a random wick to a later high is how I used to invent slopes that none of the London opens respected.

Three touches is my minimum before the line earns an entry role. Two points define geometry; the third is the first real test, and without it I treat the line as a sketch only.

The synthetic EURUSD M15 chart below shows a clean ascending line with three labelled touches, then a forced fit that ignored a mid segment spike and failed on the next open. That contrast is why I refuse to drag the ruler through noise.
I redraw only when a higher timeframe swing invalidates the old anchors, never mid trade to save a loser. Anchors stay fixed once the third touch prints.

Do you require the third touch before sizing a bounce, or enter earlier and treat the line as soft context? I still want your rule written before the open either way.

Fairman, on point five I settled on bodies for M15 lines after measuring the alternative. In my EURUSD notes, about 4 in 10 valid touches near the London open poked a wick 2 to 3 pips through a wick line, then closed back on the right side.

Bodies keep those overshoots from forcing a redraw. The cost is that a body line sits a little inside the wick extremes, so my stop goes under the wick of the touch candle, not under the line itself.

Angle gets a number as well. If a line climbs more than one M15 ATR every four candles, I treat it as a momentum burst rather than a trendline, because those slopes broke within a session most of the time.

On a close through the line, I do not reverse. I pull the target back to the last swing high and tighten the stop to the latest higher low, so the warning becomes risk control.

Stops also gather just under obvious lines, as you said. That is why the stop goes below the touch swing, past the cluster everyone else can see.

Do you draw on wicks or bodies, and did you test the other one before settling? I switched once and my redraw count dropped noticeably.

The third-touch rule is a good discipline. Another point that's easy to overlook: wick-to-wick vs body-to-body lines. Both are used, but switching between them depending on which "fits better" is the most common way traders fool themselves.

Picking one method and noting it in the trading plan solves that. Log scale also changes trendlines on longer charts, though for intraday forex it makes little difference. A line that needs to be redrawn more than once is usually a sign that the trend is ending.