(1) Core Definition: The essence of central expansion is the level upgrade after the death of the original center, which must strictly meet: overlapping fluctuation ranges of two centers, and the appearance of the third type of buying and selling points in the secondary level trend.
(2) Structural Characteristics: Unlike expansion, there is no reverse pullback segment in the expansion. Taking the rise as an example, its indicator is that the secondary level trend of the second center breaks through the original central range, and the pullback intersects with the fluctuations of the previous center (not overlapping intervals).
(3) Key Operations: Expansion represents the strengthening of the original trend's power (such as bullish center expansion). After the third type of buying and selling points, the new center directly covers the original range, and the old center is completely invalidated. In this pattern, the new center should be used as a benchmark and viewed according to the trend extension.
Summary: The key difference between central extension and central expansion is that the former will have a relatively sufficient reverse pullback segment, generally including a complete center or at least three segments of secondary level trend types; the latter does not have a reverse segment.
This article is for academic exchange on Chan theory only and should not be used as a basis for operations; the market has risks, and decisions must be made independently.