子午冲

七位取冲

The classical basis for treating Zi and Wu as a clash is found in the Sanming Tonghui, in its discussion of clashes under Lun Chongji. There the principle is set out as 七位取冲, or taking the clash at the seventh position, and Zi and Wu are used as the demonstration. Counting forward from Zi itself as the first position, Chou is the second, Yin the third, Mao the fourth, Chen the fifth, Si the sixth, and Wu the seventh. The branch reached at the seventh position is therefore the opposing branch. The same numerical pattern is illustrated with the heavenly stems: Jia Wood meets Geng as its killing stem, and counting from Jia to Geng also gives seven positions. This seven-step structure is the formal reason why Zi and Wu stand as a clash rather than merely as two branches with different elemental natures.

所属之类

Zi and Wu belong to the category of the four cardinal branches, together with Mao and You. In the Ziping Zhenquan, in the discussion of tomb and storage clashes under Lun Muku Xingchong Zhi Shuo, a distinction is drawn between two kinds of clash. The clash between the four cardinal branches, including Zi and Wu, is called a clash of assault and overcoming, or 冲克之冲, because the two branches are in mutual enmity. The clash among the four storage branches, Chen, Xu, Chou, and Wei, is called a clash of arousal, or 冲动之冲, in which the main significance is the opening or closing of the storage. The two types do not carry the same meaning.

Within the group of clashes, Zi and Wu specifically represent a battle between Water and Fire. This is a case of clashing where the two branches overcome each other by elemental opposition. It differs from the clashes of Yin and Shen and of Si and Hai, which are clashes in positions where the elements stand in a generating relationship. Zi and Wu therefore belong to the subclass of clashes marked by direct elemental conflict.

作用与化解

The Ziping Zhenquan, in Lun Xingchong Huijie Jiefa, explains that three combinations and six combinations can resolve punishments and clashes. The mechanism is that another branch draws the involved branch away or gathers it into a combination, so that the two original branches no longer attack each other. For Zi, encountering Chou can form a six combination, and for Wu, encountering Wei can form a six combination. Both are cases in which the clash is released by pulling one of the clashing branches into a combination. The clash is not necessarily eliminated in substance, but its active opposition is suspended by the new relation.

The strength of a Zi-Wu clash in a natal chart also depends on the distance between the two branches within the four pillars. When the two branches are adjacent, the force of the clash is most evident. When there is one pillar between them, the force decreases. When they are located in the year pillar and the hour pillar, separated by the month and day pillars, the clash is weak. Distance thus moderates the intensity of the opposition even when the Zi-Wu relation is present.

命例

The following chart is given as an example of the Zi-Wu clash. The four pillars are 甲辰，庚午，庚子，丁丑, and the pattern is 正官格. The Zi-Wu clash appears between the day branch and the month branch.

Worked example (solar 1964-06-20 1:00, male, computed by this site's engine):

Pattern: 正官格 · Strength: 极弱 (engine verdicts)

常见误区

One common misunderstanding is to treat all six clashes as identical in kind. The classical distinction between the clash of the four cardinal branches and the clash of the four storage branches shows otherwise. A Zi-Wu clash is a clash of mutual assault, not a clash of arousal. It should not be read as merely opening or activating something, as one might with a clash involving storage branches.

Another misunderstanding is to assume that the presence of Zi and Wu anywhere in the four pillars produces a clash of equal force. The classical principle of distance applies. Branches in adjacent pillars clash more directly; branches separated by one or two pillars produce a weaker effect. The mere appearance of both Zi and Wu does not by itself indicate a dominant clash.

A further error is to regard the Zi-Wu clash as incapable of resolution. The six-combination method described in the Ziping Zhenquan provides a recognized form of relief. If Chou combines with Zi, or Wei combines with Wu, the clash may be released because one of the branches is drawn into another structure. This does not mean the branch changes its original nature entirely, but the active opposition between Zi and Wu is no longer the governing relation.

Finally, the seven-position principle should not be applied loosely. The clash between Zi and Wu is founded on the seventh-position count, as shown in the Sanming Tonghui, and the parallel heavenly-stem count from Jia to Geng confirms the same structure. The opposition is therefore not simply a matter of north against south or Water against Fire, although those correspondences are real. The formal basis lies in the positional count, and that is what distinguishes a true clash from a general elemental tension.