Advance Block (CDLADVANCEBLOCK)

Summary

Three-candle bearish reversal pattern: three white candles with consecutively higher closes whose advance weakens (progressively smaller bodies and/or lengthening upper shadows). Signals that an uptrend's advance is being blocked. A hit (-100) is bearish: the advance is stalling/blocked; meaningful mainly within an existing uptrend.

Notes

Does not verify the prior uptrend the pattern classically assumes for significance.
Although classically read as a bearish reversal, Bulkowski's testing found the Advance Block actually acts as a bullish continuation 64% of the time. (thepatternsite.com)

Inputs

inOpen — Open price of each bar
inHigh — High price of each bar
inLow — Low price of each bar
inClose — Close price of each bar

Outputs

outInteger — -100 on a detected pattern (always bearish), 0 otherwise; never emits +100

Output Values

Value	Meaning
-100	Advance Block pattern detected: bearish
0	No pattern

Properties

Numerical Stability: Start-Independent


☐ Overlap Input
✅ Independent Y-Axis i
✅ Candlestick i
☐ Can Output NaN or ±Inf
☐ Identity at Period 1

Implementation

TA-Lib Definition: cdladvanceblock.c · cdladvanceblock.yaml

Native	File
C	`ta_CDLADVANCEBLOCK.c`
Rust	`cdladvanceblock.rs`
Java	`Core_CDLADVANCEBLOCK.java`

TA-Lib is also available for Python, R and more using a wrapper.

Aliases

Advance Block