Break of Structure (BOS) & Change of Character (CHoCH)

Hero pattern 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.