Chan Beichi Bottom Complete Guide

What is Chan Beichi Bottom?

The Chan Beichi Bottom is a sophisticated bullish reversal pattern rooted in Chan Theory (Chandao), focusing on the structural exhaustion of a downtrend. Unlike simple geometric patterns, it relies on the comparison of momentum between two downward price segments separated by a 'Zhongshu' (a central consolidation zone or 'hub' consisting of at least three overlapping sub-segments). The pattern forms when a downward trend produces this central hub, followed by a final downward thrust that reaches a new price low but exhibits significantly weaker momentum than the preceding drop. This momentum loss is technically identified as 'Divergence' (Beichi), typically measured by the area of the MACD histogram or the slope of the price action. The pattern requires a minimum of 20 bars to establish the necessary internal structure of the central hub and the exit segments. While Thomas Bulkowski does not explicitly categorize 'Chan Beichi' in his Encyclopedia of Chart Patterns, the pattern shares high-level characteristics with his 'Three Falling Valleys' and 'Falling Wedge' patterns. Bulkowski notes that patterns exhibiting momentum exhaustion and volume contraction on the final low tend to have higher success rates, with 'Three Falling Valleys' showing an average rise of 33% in bull markets. In the Chan Beichi Bottom, volume typically contracts during the second downward segment, confirming selling exhaustion. A successful reversal is signaled when the price breaks back above the lower boundary of the previous Zhongshu, often leading to a 'Third Buy Point' which confirms the trend change from bearish to bullish.

Identification Rules

1. The pattern must contain at least two distinct downward segments separated by a 'Zhongshu' (a consolidation zone with at least 3 overlapping bars).
2. The second downward segment (the exit segment) must reach a price level lower than the first downward segment (the entry segment).
3. The momentum of the second segment, measured by MACD histogram area or slope, must be lower than that of the first segment.
4. A minimum of 20 bars is required to ensure the structural complexity of the central hub and the divergence segments are valid.

References

• Thomas N. Bulkowski (2005). Encyclopedia of Chart Patterns.
• Steve Nison (2001). Japanese Candlestick Charting Techniques.

More Analysis