Break of Structure (BOS) & Change of Character (CHoCH)
Hero pattern #3 of 3. Structural events that flag continuation vs reversal.
What they are
Both events are derived from the swing-pivot stream:
- BOS (Break of Structure) — price closes beyond the most recent swing high (in a bull trend) or low (in a bear trend), confirming continuation of the existing regime.
- CHoCH (Change of Character) — price closes beyond the swing level that defined the prior trend’s end, signalling the beginning of a flip.
Practically: BOS is “trend continues”, CHoCH is “trend just broke.”
What they tell you
- BOS: the prevailing trend has fresh evidence behind it. New highs in a bull trend or new lows in a bear trend are the signal market structure is intact.
- CHoCH: the prior trend has lost. The next plausible regime is the opposite — but waiting for confirmation (HH-HL after a CHoCH to bullish) is wise.
Visual example
A bull trend prints HH–HL–HH–HL for two weeks. Suddenly, on Monday, price closes below the most recent HL by a meaningful margin. That’s a CHoCH. From here:
- A bounce that fails to make a new HH and instead prints an LH-LL confirms the bear flip.
- A bounce that does make a new HH means the CHoCH was a fakeout — the bull is still intact.
This is why “wait for confirmation” matters: CHoCH alone isn’t a short signal; CHoCH + LH-LL is.
How to use them
- BOS confirms your bias is right. Trade with the trend.
- CHoCH warns your bias may be wrong. Tighten stops, reduce size, or step out and watch for confirmation.
- MTF context: a 1h CHoCH inside a 4h bull trend is often a
retracement, not a regime flip. Always check the MTF view at
/trading-intel/structure.
When NOT to trust them
- Single-bar wicks shouldn’t drive structure decisions on a daily chart — wait for the close.
- Pre/post-market hours are excluded by default (RTH only at launch).
- Low-liquidity tickers produce noisy structure events.