Double Tops and Bottoms: Plotting the Pattern With Less Guesswork
A double top rarely gives you two identical highs. A double bottom behaves the same way in reverse. One pivot usually stops a little above or below the other, which is why experienced traders mark an area rather than force both pivots onto one horizontal line.
Drawing that area by hand is easy after the move has finished. Detecting it while the second pivot develops is harder.
Neostox automates this work with an intelligent zigzag based pattern detector. You can select the double top or double bottom setup, deploy it, and watch potential formations appear during market hours. The detector checks more than one lookback, so a pattern missed by a short swing setting may still appear through a longer one.
Automation saves time. It does not remove the need for confirmation.
Why a rectangle makes more sense than a line
Suppose a stock reaches ₹842, falls to ₹806, and later reverses near ₹836. Most traders would accept those two highs as a possible double top. Rejecting the setup because the second peak missed the first by ₹6 would impose precision that the market never promised.
A rectangle accommodates that difference. Its width covers the period between the pivots, while its height allows a reasonable tolerance around their prices.
Make the zone too narrow and valid formations disappear. Make it too wide and almost any two pivots qualify. The tolerance needs a defined rule.
A perfect match can happen, but it should not be the requirement. Even if both highs print at ₹842, the apparent precision may come from the tick size rather than any special behaviour at that exact price.
The same logic applies to double bottoms. Two lows can belong to one support area without sharing an identical price.
Open and close prices remove some wick noise
Most chart drawings use candle highs for tops and candle lows for bottoms. That choice captures every traded price, including brief spikes that lasted for a few seconds.
Open and close prices give another view.
For a potential top, the higher end of the candle body is the relevant body price. For a potential bottom, use the lower end. A candle that trades at ₹515 but closes at ₹507 will therefore contribute ₹507 to a body based top rather than the full ₹515 wick.
That can clean up a chart quickly. It also discards information.
A long upper wick may record genuine rejection by sellers. Ignoring it can make two candle bodies look similar even though buyers reached very different prices during the two tests. Open and close based patterns should therefore be described as less sensitive to isolated spikes, not automatically more reliable.
“More powerful” needs evidence. Test body based and wick based versions on the same instrument, timeframe, and period. Compare confirmed trades after brokerage, slippage, and option spread costs. A cleaner chart alone proves very little.
One practical approach is to let the candle bodies define the zone while treating the wicks as an extra tolerance check. If the bodies match but the second wick extends far beyond the first, inspect the chart before accepting the signal.
The 81% to 111.1% ratio needs a precise definition
The suggested acceptance band runs from roughly 81% to 111.1%. That range can stop the detector from demanding two perfectly equal swings, but the ratio must refer to a named measurement.
Calling the band a Fibonacci rule is questionable. Neither 81% nor 111.1% is a standard Fibonacci retracement level. They are better treated as configurable similarity limits unless the calculation derives them from a separate, documented Fibonacci method.
Assume a possible double top prints its first body high at ₹842, drops to a neckline near ₹806, and returns to ₹836. The first decline covers ₹36, while the rebound recovers about ₹30. That second move is roughly 83% of the first, so it fits inside the proposed band without pretending both legs are equal.
There are several possible ratios a detector could calculate. It might compare the lengths of the two swing legs. Another method could compare the second pivot’s distance from the neckline with the first pivot’s distance from it. These are not interchangeable, and users should know which one the tool applies.
Comparing the absolute prices of two tops would be a weak test. A move between ₹2,480 and ₹2,500 already produces a ratio close to 100%, even when the swing structure around those prices bears little resemblance. Normalize the measurement around the neckline or swing depth instead.
Zigzag settings decide what the detector can see
A zigzag converts a noisy price series into alternating swing highs and lows. The difficult part lies in deciding when a move is large enough to become a swing.
Use a very short lookback and the chart fills with minor pivots. A longer setting removes much of that activity, though it may detect the pattern later. There is no single setting that fits a five minute Bank Nifty chart and a daily chart of a slow moving large cap.
This creates a problem for manual scans. A formation may look incomplete under the current setting while a longer lookback already contains two clear peaks and a neckline. The reverse can happen as well: a small double bottom visible intraday may disappear once the chart focuses on larger swings.
A useful automatic detector checks several lookback lengths rather than betting everything on one zigzag setting. It should also avoid reporting the same structure repeatedly when nearby settings identify almost identical pivots.
There is a catch. The latest zigzag pivot can change.
If price keeps rising after a provisional swing high appears, the zigzag may move that pivot upward. A potential double top can therefore shift or vanish before confirmation. Any runtime tool should distinguish a developing formation from a confirmed one instead of presenting both with the same status.
Detection comes before the trade decision
Two similar peaks do not complete a double top. Price must break the trough between them, usually called the neckline. Until then, you have a potential formation and nothing more.
For a double bottom, confirmation comes when price breaks above the intervening swing high. Some traders accept an intraday break. I prefer a candle close beyond the neckline because quick breaches often reverse before the candle finishes.
Take an illustrative Nifty setup with a first body high near 22,183, a neckline around 21,872, and a second body high near 22,147. The rebound recovers about 88% of the earlier decline, which fits the stated tolerance. The pattern still remains unconfirmed while Nifty trades above 21,872.
A close below that neckline would complete the double top. The pattern height is roughly 311 points, which gives a conventional objective near 21,560 after reasonable rounding. Treat that as a reference area, not a guaranteed destination. Price can stall earlier, gap through it, or retest the broken neckline before continuing.
The author notes did not include a dated market chart or an actual trade log, so this example is illustrative rather than a claimed trade.
Stops need equal care. Placing one exactly above the second top may be too tight when the pattern itself permits an 81% to 111.1% similarity range. The stop should reflect the zone boundary, the instrument’s recent movement, and the amount you can lose. If that distance makes the position too large for your risk limit, reduce the quantity or skip the trade.
Neostox can handle the repetitive part: scanning several lookbacks, plotting the zone, and updating the setup during runtime. Your decision begins when the label says whether the latest pivot remains provisional and whether the neckline has actually closed beyond its trigger.