Market structure (2/12): BOS vs. CHoCH — how to know if a trend is still alive or just dying

You're sitting at the EUR/USD chart, the price is nicely rising, you're finally up by 40 pips, and suddenly one quick candle drops down. In your head, you think: "Did it reverse? Or is it just a correction?" You close the position, breathe a sigh of relief — and the market shoots up another 80 pips without you within an hour. Sound familiar? The difference between whether it was a BOS (continuation of the trend) or CHoCH (change of character) would have told you much more than your panic at that moment.

In the first part, we dissected candlestick anatomy. Today, we go a level higher — to market structure, which is the backbone of all chart reading without indicators.

Market structure in three sentences

The market doesn't move straight, but in waves. When it paints higher highs and higher lows, it's descriptively an uptrend. When it makes lower highs and lower lows, it's a downtrend. And when it jumps up and down in a range without a clear shift — it's a range (sideways).

The magic is that the market itself tells you what phase it's in. Just watch whether the last significant high/low holds or breaks.

A small note on origin: the terms BOS and CHoCH in this form were popularized by modern methodologies like SMC and ICT. However, we take them generically — as general names for market geometry that traders described long before, not as the holy grail of any particular "course."

BOS: the trend says "I'm continuing"

Break of Structure (BOS) = breaking the last significant high (in an uptrend) or low (in a downtrend) in the direction of the trend.

Imagine an uptrend:

Low A at 1.0800
High B at 1.0850
Correction to low C at 1.0820 (higher low than A ✅)
Price rises again and breaks 1.0850 → that's BOS.

Breaking high B confirms that buyers are still in control and the structure of higher highs/lows continues. BOS isn't a signal of "something new" — it's a stamp on what's already running. Ideally, you want the price to close beyond the level with the body of the candle, not just flicker with a wick.

Similarly, in a downtrend: breaking the last significant low downwards = BOS on the short side.

CHoCH: the first warning that something is breaking

Change of Character (CHoCH) = the first break of structure AGAINST the current trend.

Let's stay in the uptrend from the example above:

Low C was at 1.0820
Price rises to a new high D at 1.0880
Then it falls and breaks down below 1.0820 (the last significant higher low)

Here, something happened for the first time that an uptrend "isn't supposed to do" — the price broke the structure of rising lows. This is CHoCH: the first warning that the character of the movement might be changing from rising to falling.

Note the word might. CHoCH isn't a confirmed reversal. It's a change of character, not automatically a new trend. A reversal is confirmed only when a new structure in the opposite direction (lower high + BOS down) follows CHoCH.

Numerical example to make it fit

Let's have a fictional stock traded in an uptrend:

Point	Price	Type
A	100 Kč	low
B	110 Kč	high
C	104 Kč	higher low
D	118 Kč	higher high
E	108 Kč	higher low

As long as the structure holds (E > C > A and D > B), the trend is upwards.

BOS Scenario: the price rises from point E and breaks 118 Kč (high D) → confirmation of continuation. The structure continues, the last "safe" significant low is 108 Kč.

CHoCH Scenario: the price from around high D doesn't fall to a higher low but breaks below 104 Kč (the last significant higher low C) → the first warning of a change in character. The market made a lower low for the first time, which "violates" the uptrend.

Notice the key thing: in both BOS and CHoCH, we are interested in breaking a SPECIFIC significant level — not a random candle two pips away.

Statistics and reality: the concept is probability, not certainty

Here we must be honest. BOS and CHoCH are not the holy grail, and no one guarantees you the outcome. They are tools for probabilistic chart reading, which make sense only in context.

What we know descriptively and long-term:

Trend movements make up roughly only a smaller part of the time — markets are, according to many historical observations, in range significantly more often than in a pure trend (mostly "sideways").
This means that false breakouts (so-called fakeouts) are plentiful in the range phase — the price breaks a level, scares traders, and returns.
CHoCH has higher informational value when it appears after a prolonged, mature trend — not after three candles up.

Important: even a perfectly read structure is no guarantee. It can easily happen that the price makes a CHoCH, looks like a reversal — and then just takes a short breath and continues in the original direction. That's why the concept fails most often in range, where "significant levels" aren't significant because the price just bounces back and forth between them. In range, BOS/CHoCH is almost worthless.

Most common mistake: BOS on noise

The vast majority of beginner "BOS" are actually breakouts of insignificant micro-highs on a low timeframe. The price makes three candles, breaks a local bump by 1–2 pips, and the trader shouts "BOS confirmed!"

Problem: you broke noise, not structure. A significant high/low is a point where:

a visible market reaction occurred (rejection, reversal),
on a higher timeframe, it is visible to the naked eye,
it's not just one random wick among twenty similar ones.

Imagine it like this: the price oscillates between a strong daily floor at 100 and a ceiling at 150. In the middle of this range, you make a "micro-BOS" on a five-minute chart — and watch in confusion as the daily resistance takes you down. Structure makes sense only when set in the context of a higher timeframe.

Another common mistake: mistaking CHoCH for a confirmed reversal and flipping the entire position on the first break. CHoCH is a warning, not an order.

Practical framework — checklist you can use today

Determine the structure timeframe. Draw the structure on a higher frame (e.g., H4/D1) and read it in its context. Lower frame = more noise.
Mark ONLY significant highs and lows. Rule: if you have to squint and think "is this a high?", it's probably not a significant high. Significant points are obvious.
Distinguish the phase: do you have higher H and higher L (trend), or is the price jumping in a range (range)? In range, ignore BOS/CHoCH.
BOS = confirmation of the direction already running. Ask: did the price break the last significant high/low IN the direction of the trend and close beyond it?
CHoCH = first break against the trend. Take it as a yellow card, not a red one. Wait for confirmation with a new structure.
Stop as STOP-ALERT. Place an alert (not an automatic sale) behind the last significant structure — e.g., just below the higher low E at 108 Kč from the example. When the level breaks, you'll get a signal to reassess, not to panic.

Exercise for today: open a chart of any asset on the daily timeframe and retrospectively mark the last 5 significant highs and lows. For each breakout, note whether it was a BOS or CHoCH.

In QMA

Manually searching "is this a significant high or noise?" across dozens of tickers is tedious and subjective. In QMA, the structure pattern tool helps you filter — instead of staring at twenty charts and guessing where the trend breaks, you get a clear overview of situations where the structure is changing, along with key zones on a higher timeframe. QMA does this sorting for you, so you can focus on decision-making, not clicking. It's not a crystal ball — it's a filter that saves you time and reduces the chance of mistaking noise for BOS.

What to take away

BOS = continuation of the trend (breaking the last significant high/low in the direction of the trend). CHoCH = first warning of a possible change (breaking against the trend).
Distinguish trend vs. range before you start reading the structure — in range, the concept is almost worthless and full of fakeouts.
Draw only significant points, not micro-wicks; BOS on noise is the most common trap.
Set a stop-alert behind the last significant structure as a warning to reassess — and remind yourself that it's about probability, not certainty.

Start by reviewing today's structure patterns: open in QMA.

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Disclaimer: This article is for educational purposes only and should not be considered as financial advice. Always conduct your own research or consult with a financial advisor before making trading decisions.

📐BOS vs. CHoCH: How 40 pips decide if a trend lives or dies

Market structure (2/12): BOS vs. CHoCH — how to know if a trend is still alive or just dying

Market structure in three sentences

BOS: the trend says "I'm continuing"

CHoCH: the first warning that something is breaking

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