Break of Structure, Change of Character and Market Structure Shift

The previous lesson gave you swings. Now let's see what happens when price breaks them. There are three words (BOS, CHoCH, MSS) and on social media they're used confusingly, even contradicting each other. Here we define them precisely, so you can write them as verifiable rules, the only way to be able to test them.

Break of Structure (BOS): structure continues

A BOS is the break of the previous swing in the direction of the trend. In an uptrend, when price closes above the last swing high, you have a bullish BOS: the trend is confirmed and a new higher high forms. In a downtrend, the BOS is the close below the last swing low.

The BOS says: the trend continues. It's not an entry signal: it's information about context. Entering at market after the BOS often means buying at the top; the operational interest is in the subsequent retracement, where price returns toward areas of value (we'll see them in the next modules).

Change of Character (CHoCH): the trend loses its defining feature

A CHoCH is the first break in the opposite direction to the current trend. In an uptrend, it's the close below the last higher low (the low that originated the last high). In a downtrend, the close above the last lower high.

What it means and what it does not mean:

• It means the trend has lost its essential feature (in an uptrend, the rising lows).
• It does not mean the trend is over. After a CHoCH can come: a range, a deeper correction, a resumption of the original trend or a true reversal.
• It's an alarm, not an order to flip your position.

Market Structure Shift (MSS): the ICT variant

In ICT language people talk of MSS, with the same underlying concept as the CHoCH: the break of structure in the opposite sense. Some educators distinguish the two terms (for example, MSS = a break accompanied by strong displacement; CHoCH = a simple break), others use them as synonyms. It doesn't matter which name you use: what matters is that you write the rule down. In this course we'll use:

• CHoCH/MSS: a close beyond the last "protected" swing in the opposite direction.
• Displacement: one or more strong candles accompanying the break (for example a body greater than 1.5 times the ATR). If there's displacement, the break carries more weight.

Body or wick? Close or touch?

Decide once and for all and stay consistent. The two options:

When in doubt, to begin with use the body close. In the liquidity lesson you'll see why a wick beyond the level with a subsequent return is a phenomenon of its own (the sweep), often more interesting as a contrary signal.

A reasoned example

False signals and how to reduce them

Many breaks lead nowhere. Here are the most frequent reasons and how to defend yourself:

• Break against the higher-timeframe trend: a bearish CHoCH on H1 inside a strong D1 uptrend is often just a pullback. Rule: always assess the major timeframe.
• Break without displacement: small, uncertain candles beyond the level are weak.
• Breaks in low-liquidity moments (Asian hours, holidays): they can be artefacts.
• Breaks near news: the move can reverse violently.
• Sweep mistaken for a break: wick beyond the level and immediate return (next lesson).

A useful statistic to collect yourself: how often a CHoCH leads to a true reversal (new opposite lows/highs) versus how often price resumes the original trend. It will surprise you, and teach you caution.

How to use BOS and CHoCH in practice

1. Direction filter: look for buys only if the last relevant break on your timeframe is a bullish BOS (or a bullish CHoCH from a downtrend).
2. Sequence of confirmations: a CHoCH on the high timeframe is strong information; a CHoCH on a low timeframe is a possible entry trigger when it sits in an area of interest of the high timeframe.
3. Invalidation level: every reading has a level that refutes it. It must be written before entry and is where the stop goes.

Now look at a real chart and look for BOS and CHoCH:

Anatomy of a complete reversal

The transition from a downtrend to an uptrend (or vice versa) doesn't happen with a single candle. Observing many cases, you see a recurring sequence, useful to keep in mind as a scheme:

1. Established downtrend (LH and LL).
2. Sweep or exhaustion: price pushes below an old low (often with a wick) and doesn't continue.
3. Bullish CHoCH: the close above the last lower high. For the first time, the bearish structure breaks.
4. Retracement of the nascent uptrend: price falls but doesn't make a new low beyond the sweep low: a possible HL forms.
5. Bullish BOS: price exceeds the retracement's high and confirms the new direction.

Note that the first signal (CHoCH) is the riskiest to trade (it could be a simple bounce), while the second (BOS after the HL) is later but often more reliable. Each trader chooses a compromise between speed and confirmation, and the choice must be written and tested.

Minor structure and "inducement"

Before an important move, many SMC traders speak of inducement: a minor (internal) break of structure that "lures" orders in the wrong direction before price makes the real move. Beyond the name, the observable phenomenon is this: the first internal breaks after a retracement are often false, because the retracement isn't over yet.

A practical, verifiable rule: don't treat a low-timeframe CHoCH as valid unless it happened inside an area of interest of the high timeframe and after price has "taken" (swept) a nearby liquidity level. In the liquidity lessons you'll understand why.

How to write BOS and CHoCH as rules

An objective trading system requires pseudocode, not opinions. Here's how to translate the concepts into verifiable conditions (we'll use the same scheme in Python in module 5):

Given: list of confirmed swings (with n candles per side)
Uptrend if:   last swing high > previous swing high
          AND last swing low  > previous swing low

Bullish BOS:  close > last confirmed swing high
Bearish CHoCH (in an uptrend):
              close < last protected swing low (the HL that originated the last HH)
Displacement: body of the breaking candle > 1.5 x ATR(14)

Notice two details: only already confirmed swings are used (to avoid look-ahead) and the break is on the close. The rules are written so that two different people, applying them, arrive at the same label.

Edge cases that cause confusion

• Monday gap: price opens beyond the level. Recommended convention: if it opens beyond the swing, the break occurred at the open; note it but treat it with caution.
• Breaks over several candles: if the body doesn't close beyond but price "pushes" for several candles, the written rule decides (close required or not).
• Breaks during news: often cancelled within minutes; ignore breaks in the news window.
• Nearly equal swings: two highs at 1.1000 and 1.1002. Define a tolerance (for example 2 pips or 0.1 × ATR) within which they're considered "equal": you'll see they're liquidity areas (equal highs).

What you should measure

Build a table with at least 30 CHoCH and for each note:

After 30-50 cases look for patterns: do CHoCH "with the high timeframe and preceded by a sweep" have a different outcome from those "against the high timeframe with no sweep"? This is the difference between believing a concept and verifying it.

In short

• BOS: break of the swing in the direction of the trend = continuation.
• CHoCH/MSS: first break in the opposite direction = the trend loses its defining feature, it doesn't necessarily end.
• Write down whether you use close or wick; to begin with use the body close.
• Displacement (strong candles) gives the break more weight.
• Breaks against the higher timeframe, without strength or in low liquidity are the most fragile.

Practical exercise

1. On an H1 mark 10 BOS and 10 CHoCH with the rule "close beyond the swing".
2. For each CHoCH note what happened in the next 20 candles: reversal, range or resumption.
3. Calculate the percentage of true reversals. How does it change if you consider only CHoCH with displacement?