Every trend is a sequence of swing highs and swing lows. While price keeps printing higher highs and higher lows, buyers are in control; the mirror holds for downtrends. The moment that sequence breaks is where structure — and often the trade — begins. Edo Smart Money Map marks these breaks automatically, but understanding them by hand makes the tool far more useful.
What is BOS and CHoCH in trading?
BOS (Break of Structure) and CHoCH (Change of Character) are the two ways price can break a swing level. A BOS breaks it in the direction the trend was already going, so it confirms the side in control. A CHoCH breaks it against that direction, so it is the first structural warning that control may be changing hands. Both are read from swing highs and lows on closed bars — nothing else is needed to identify them.
To check your own reading on a live chart, Edo Smart Money Map labels every BOS and CHoCH for you — free and open source.
BOS vs CHoCH: the difference in one line
Same level, same break, opposite meaning: what separates them is the bias in force before the break. In an uptrend, taking out the last higher high is a BOS and losing the last higher low is a CHoCH. In a downtrend it mirrors — a new lower low is a BOS, reclaiming the last lower high is a CHoCH. This is why labelling a break without knowing the prevailing bias is meaningless, and why two traders can look at the same candle and disagree.
Break of Structure: the trend continues
A Break of Structure (BOS) happens when price closes beyond the last relevant swing in the direction of the prevailing bias — a higher high broken in an uptrend, a lower low broken in a downtrend. It confirms that the side already in control still holds it. A clean run of BOS in the same direction is the signature of a healthy trend, and each one leaves a fresh order block to watch on the next pullback.
Change of Character: control may be shifting
A Change of Character (CHoCH) is the opposite: price breaks structure against the prevailing bias — losing the last higher low in an uptrend, or reclaiming the last lower high in a downtrend. It is the first structural sign that control may be changing hands. A CHoCH is not an entry by itself; it is the cue to lower conviction in the old direction and watch how price behaves at the order block the move leaves behind. The exact same level break can be a BOS or a CHoCH — the difference is purely the context of the prevailing bias.
How to spot a BOS or a CHoCH on the chart
- Mark the last confirmed swing high and swing low — the two levels that define the current leg.
- Decide the prevailing bias from the sequence that got price here: higher highs and higher lows, or the mirror.
- Wait for a bar to close beyond one of those levels. A wick through it is not a break.
- Label it: with the bias it is a BOS, against the bias it is a CHoCH. Then watch the order block the move left behind.
Is MSS the same as CHoCH?
In practice most traders use MSS (Market Structure Shift) and CHoCH for the same event: the first break against the prevailing bias. Where they differ is strictness — some reserve MSS for a break that also takes out the swing behind the previous BOS, and treat CHoCH as the earlier, weaker warning. The label matters far less than the rule: define which swing counts, confirm it on the close, and the terminology stops being a problem.
Why closed-bar validation matters
The value of BOS and CHoCH depends entirely on how a break is confirmed. A wick that pierces a level intrabar and closes back inside is not a break — it is often a liquidity grab. Validating structure only on closed bars removes those false signals at the cost of confirming a little later. It is the single most important rule for trading structure cleanly, and it is why non-repainting tools are worth the small delay.
