Market Structure Breaker Indicator: BOS Against CHoCH

Written by Dominic Walsh · Published 16 Jun 2026 · Last updated 9 Sep 2026

The market structure breaker indicator draws a line most structure tools blur. A break in the direction the market was already going extends the trend. A break the other way changes its character. Two colour pairs keep those apart, so the chart tells you which one happened.

This build ships as a compiled .ex4 for MT4 and .ex5 for MT5; the screenshots below come from EURUSD H1.

Platforms	MT4 (.ex4) + MT5 (.ex5)
Chart window	Main price chart
Plots	4: BOS Buy, BOS Sell, CHoCH Buy, CHoCH Sell
Alerts	popup, push notification, email, sound
Inputs	15

What the Market Structure Breaker Indicator draws on the chart

BOS Buy and BOS Sell are lime and red, marking a break that continues.

CHoCH Buy and CHoCH Sell are aqua and magenta, marking a change of character.

OBJ_TREND lines join the broken level when `ShowStructureLines` is on.

OBJ_TEXT labels name each swing when `ShowLabels` is on.

• BOS Buy: arrow, lime, width 2, arrow code 233
• BOS Sell: arrow, red, width 2, arrow code 234
• CHoCH Buy: arrow, aqua, width 2, arrow code 233
• CHoCH Sell: arrow, magenta, width 2, arrow code 234

How the Market Structure Breaker Indicator calculates its values

Tracking the swings

IsSwingHigh and IsSwingLow confirm a pivot with `PivotStrength` `3` bars on each side. The code keeps a rolling list and shifts older entries down as new ones arrive. `StructureLookback` `50` bounds the search.

Separating the two events

Breaking a swing in the direction of the previous structure fills the BOS buffers. Breaking one against it fills the CHoCH buffers. The same price break can be either, depending on what came before.

Capping the drawing

`MaxObjects` `200` limits how many structure lines and labels stay on the chart. Both events are common. Without a cap a long history would leave the terminal drawing thousands of objects.

How to read the signals

Lime and red mean the trend just extended itself.

Aqua and magenta mean the market broke the other way. That is the warning.

The first change of character after a long run is the one worth noticing.

Labels show the swing sequence behind each judgement.

Alert channels in this build: popup, push notification, email and sound, one message per closed bar.

`EnableAlerts` starts on with `EnablePopup` and `EnableSound` both true, while `EnablePushNotify` and `EnableEmail` begin false. `SoundFile` picks the clip. Events confirm on closed bars, one message per bar.

Every Market Structure Breaker Indicator input

Core settings

Setting	What it does	Default
StructureLookback	Swing detection window (bars each side). Bars the swing search covers, default `50`.	50
PivotStrength	Bars left/right to confirm a pivot. Bars each side confirming a pivot, default `3`.	3
MaxObjects	Cap drawn structure objects. Cap on drawn structure objects, default `200`.	200

Display settings

Setting	What it does	Default
ShowLabels	Draw HH/HL/LH/LL text labels. Draws the swing text labels, default `true`.	on
ShowStructureLines	Draw BOS/CHoCH lines. Draws lines at the broken levels, default `true`.	on
BullishColor	Bullish colour, default lime.	lime
BearishColor	Bearish colour, default red.	red
NeutralColor	Neutral colour, default silver.	silver
ArrowOffsetPoints	Arrow offset above/below bar. Mark distance from the bar in points, default `20`.	20

Alert settings

Setting	What it does	Default
EnableAlerts	Master switch for the break event alerts, default `true`.	on
EnablePopup	Terminal dialog on a break event, default `true`.	on
EnablePushNotify	Phone push on a break event, default `false`.	off
EnableEmail	Mail delivery on a break event, default `false`.	off
EnableSound	Sound playback on a break event, default `true`.	on
SoundFile	Wav clip for the break alert, default `alert.wav`.	alert.wav

Settings that fit your chart

Structure work needs swings large enough to read. EURUSD H1 is the reference chart, where `PivotStrength` at `3` picks turns lasting a few hours. On M5 both event types fire constantly. On H4 a change of character is rare and usually matters.

When the Market Structure Breaker Indicator fails

A three-bar pivot is small, so plenty of events describe noise.

The tool decides continuation against change of character mechanically, from the previous structure alone.

Both event types confirm three bars late, because the pivot has to confirm first.

Copy the compiled Market Structure Breaker Indicator file into your MQL4/Indicators folder, and the MT5 build into MQL5/Indicators, then restart the terminal and drag it onto a chart. The step-by-step guide with screenshots is at how to install MT4 and MT5 indicators.

Download the Market Structure Breaker Indicator for MT4 and MT5

The zip holds the compiled Market Structure Breaker Indicator build for MT4 and MT5, plus a short README. Compiled files only, no source. Enter your email below and the download link arrives in your inbox.

FAQ

When does CHoCH Buy print instead of BOS Buy?

When the break goes against the previous structure. Breaking a swing high during a run of higher highs extends the trend, so lime takes it. Breaking one after a run of lower highs changes character, and aqua takes it instead.

Why does PivotStrength delay every event?

Because a swing needs three newer bars to close without beating it. On EURUSD H1 that is three hours. Every arrow inherits the delay, since the break gets measured against a confirmed swing.

What do the ShowStructureLines objects add?

A line at the level that broke. Without it an arrow tells you an event happened, but not which swing gave way. Turn them off on a busy chart. `MaxObjects` `200` caps the count either way.

How many bars does StructureLookback cover?

Fifty, which on EURUSD H1 is two days. That bounds which swings a break can target. Widening it lets older structure count, and that usually shifts more events from continuation into change of character.

Are results guaranteed?

No. Trading involves risk. Results are not guaranteed; past performance is not indicative of future results. Use the Market Structure Breaker Indicator as one input. Always backtest before trading live.