Combinations and Clashes in BaZi (合沖刑害)

The article on Day Master strength ended on a deliberate loose thread. After weighing how much support and how much pressure surround the self, it noted that there is another layer — a set of relationships between the branches themselves — that can nudge the whole judgment up or down before you settle it. This is that layer. The Earthly Branches do not just sit in their pillars minding their own business; they pull on each other, combine with each other, and clash with each other, and those interactions quietly re-weight the elements a strength reading is built on.

None of it is event-prediction. A clash is not a car accident and a combination is not a wedding. These are structural relationships between positions in a chart — the same phrase the glossary uses for every branch — and what they reshape is the elemental balance, not the calendar.

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The branches were never inert

Recall what an Earthly Branch actually is. Each of the twelve — Zi, Chou, Yin, Mao, and the rest — is a unit of time (a two-hour period, a month defined by the solar terms, a seasonal position) that carries one to three hidden stems (藏干), the concealed Heavenly Stems through which it holds its elements. Because they carry elements, they can reinforce or cancel each other. That is the whole basis of this layer: when two branches interact, the elements they carry are amplified, redirected, or destabilized — and since Day Master strength is a tally of which elements support or drain the self, anything that changes the elements changes the tally.

There are three interactions the chart treats as load-bearing, and each branch entry in the glossary names its own: a clash, a trinity, and a combination.

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Clashes (六沖): the opposite axis

A clash (六沖) is the relationship between two branches sitting directly across the cycle from each other — six pairs, each an axis: Zi–Wu, Chou–Wei, Yin–Shen, Mao–You, Chen–Xu, Si–Hai. The sharpest of them is Zi against Wu — deep-winter Water against high-summer Fire, the two poles of the year set against each other.

A clash is destabilizing: the two branches pull in opposite directions, and the elements they carry are agitated rather than settled. In a strength reading, a clash can knock out or weaken support the self was relying on, or break up a source of pressure — it depends entirely on which branches clash and what role each was playing. The discipline is to read it as a structural disturbance on a particular axis of the chart, never as a fixed bad omen. A clash that breaks a harmful concentration is doing you a favour; a clash that scatters needed support is not. The interaction is neutral; the consequence depends on the rest of the chart.

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Trinities (三合): three branches, one element

A trinity (三合) is the opposite move — three branches that lock together to reinforce a single element. There are four, one per element:

• 申子辰 (Shen–Zi–Chen) → Water
• 寅午戌 (Yin–Wu–Xu) → Fire
• 巳酉丑 (Si–You–Chou) → Metal
• 亥卯未 (Hai–Mao–Wei) → Wood

In a simplified teaching frame, each trinity has a centre — its strongest member, the branch whose own element the trinity reinforces — flanked by an opening member and a storehouse member. Zi is the centre of the Water trinity; Chen is its storage member, joining the same Water group from the other side. When the branches of a trinity appear together in a chart, the element they point to is strongly amplified — which can decisively tip a borderline strength reading. A self that looked balanced can read as clearly strengthened or clearly burdened once you notice a full trinity is feeding one element underneath it.

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Combinations (六合): the pairing toward an element

A combination (六合) — literally "six combinations," six pairs — is the gentler cousin of the trinity: two adjacent branches said to combine and lean toward a particular element. Zi pairs with Chou, the two combining toward Earth; Yin pairs with Hai, combining toward Wood; Chen pairs with You toward Metal, and so on around the wheel.

A combination tends to bind the two branches together and soften whatever else they were doing — a branch tied up in a combination is, loosely, less available for its other roles. Like the trinity, it can add weight to one element; unlike the clash, it stabilizes rather than disturbs. In practice these are subtler than clashes and trinities, and schools weigh them differently, but the principle is the same: a pairing that changes the elemental picture changes the strength picture downstream.

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A more contested layer: punishments and harms (刑害)

Traditional Bazi names two further branch interactions — punishments (刑) and harms (害) — and popular writing leans on them heavily. They belong in an honest account, but with a clear caveat: they are the most contested part of this layer. The schemes for which branches punish or harm which vary considerably between schools, their effects are read far more loosely than clashes and combinations, and this site's branch glossary deliberately formalizes only the clash, trinity, and combination — the three with stable, agreed definitions. Treat 刑 and 害 as a faint additional texture some readers add, not as a fourth pillar of the system, and be especially wary of anyone who turns them into concrete predictions. The further a claim travels from "this re-weights the elements," the more skeptical it deserves to be.

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Why this layer matters — and what it is not

Put together, combinations and clashes are the reason a Bazi chart is read as a web and not as four independent pillars. Two charts with the same eight characters in a different arrangement can read differently because the branches fall into different clashes and trinities. The strength of the self is not just a headcount of supporting versus draining elements; it is that headcount after the branches have finished pulling on one another.

What this layer is emphatically not is a forecast. Every branch entry repeats the same line — these are "structural relationships between positions in the chart, not predictions of events" — for a reason. A clash on your chart's axis does not schedule a conflict; a trinity does not promise a windfall. They reshape the elemental balance that a reading is built on, and that balance is a description of structure, not a timetable of what will happen to you.

To see your own branches and their elements laid out, open the BaZi calculator: it plots all four pillars, their hidden stems, and the elemental balance the self is read against — the raw material this layer operates on. From there, the Day Master strength and Ten Gods articles are the two passes that turn that material into a reading, and the glossary entry for any branch will tell you, in plain English, exactly which clash, trinity, and combination it carries.