Three-line break

Kagi charts define a reversal by looking at the previous swing high or low. But what if the previous swing low happened six months ago, and the stock is now 200% higher? Waiting for the price to crash all the way back to that old low before triggering a sell signal is disastrous.

We need a chart that filters out noise during an uptrend, but dynamically tightens its safety net as the trend matures.

The Three-Line Break chart is a Japanese price-charting method (also called the "three-step break"). Its name comes directly from its one rule: the line only reverses direction after price breaks the extremes of the previous three lines. The idea is that you do not chase every minor fluctuation — you change your read of the trend only when a move is large enough to break through the recent structure.

Like other noise-filters, it ignores time and only plots blocks when the price moves in the direction of the trend. But its rule for a reversal is what makes it special: it requires the price to break the extreme of the last three consecutive blocks.

Instead of a fixed box size (like Renko) or a fixed swing point (like Kagi), Three-Line Break uses recent history:

1. Continuing the trend: If the price closes higher than the top of the previous green block, a new green block is drawn. If it closes lower than the previous red block, a new red block is drawn.
2. Ignoring noise: If the price pulls back, but doesn't trigger a reversal, nothing is drawn.
3. The Reversal: To print a red block in an uptrend, the price must close below the lowest point of the last three consecutive green blocks.

Every price in this module is an illustrative example, not a real quote. [illustrative]

Below is a fixed example at the default of three lines. A block prints when price beats the previous block in the trend; to reverse, price must break the extreme of the last three blocks — so reversals are deliberately hard to trigger.

Three-Line Break charts excel at keeping you in steady, grinding trends while providing a trailing stop-loss that automatically adjusts.

1. The steady grinder: A slow-moving utility stock prints 10 green blocks in a row. Because the blocks are small and tightly packed, the "low of the last 3 blocks" is right behind the current price. If the stock suddenly dumps, the reversal triggers almost immediately, protecting your profit.
2. The parabolic explosion: A momentum stock spikes 50% in three days, printing three massive green blocks. The "low of the last 3 blocks" is now 50% below the current price! The safety net is incredibly wide, meaning you will have to suffer a massive crash before the chart flashes red.

Because a reversal requires breaking the extremes of the last three blocks, the actual reversal block itself is often massive.

By the time a red reversal block is finally drawn on your screen, the stock has already suffered a severe drop. The chart is telling you "the trend has officially changed," but it is telling you this after the damage is done.

The trap with Three-Line Break is identical to Kagi: the delay.

Traders pull up a Three-Line Break chart and see how beautifully it filtered out all the fake-outs in the past. But they forget that trading it live is psychologically brutal. When a stock is plunging, and you are waiting for it to break the bottom of the third prior block before you sell, you are watching your actual money burn in real-time.

So before you trust a fresh red block, ask: what would change your mind? If price snaps back above the reversal block within a block or two — a common whipsaw near the flip — the "confirmed trend change" was mostly noise, and the read flips back.

All these Japanese noise-filtering charts (Heikin-Ashi, Renko, Kagi, Three-Line Break) do the same thing: they alter or ignore reality to make a trend look prettier. They are excellent for analysis, but dangerous for execution.

But what if we wanted to ignore time, not to filter out noise, but to filter out boredom? What if we wanted a chart that proved how volatile a stock is, regardless of the clock?

That brings us to Range bars.