There is no indicator that can achieve a 100% accuracy rate, even with the powerful and currently known most practical left-side trading system TD indicator. This is because all indicator data is generated based on previously completed data, belonging to the statistics of completed data (therefore, all indicators essentially belong to statistics), and completed data cannot represent incomplete data. However, there is one type of data that can achieve 100%, as it belongs to geometry rather than statistics, which is the Chán theory.

In Chán theory, 100% is based on divergence. For example, after a buy (or sell), it will 100% reverse trend, and at least rise (or fall) back to the previous low (or high) position; similarly, after a second buy (or sell), it will also 100% reverse trend (Note: the third buy and third sell are actually the same; however, the difficulty of grasping the third buy and third sell is too great, so if the technique is not sufficient, it is not recommended to trade based on them). As for how the trend will reverse, for example, how much can increase after the second buy, that belongs to another question, such as it can be a segment or a central point; but there is an increase, which is 100%.

However, divergence has levels. All price reversals are theoretically a buy (or sell), only differing in the level of divergence. A monthly level divergence may only be encountered once in a person's lifetime (or it may even be possible to not encounter it at all); while a 1-minute level divergence can occur multiple times during daily trading.