乙庚合（Yi–Geng） — the Yi & Geng combination

The classic springtime pairing — the soft vine that gives the blade its meaning.

乙庚合 — the combination of Yi Wood and Geng Metal — is the classical marriage of softness and steel, and the old texts call it the Benevolence & Righteousness combination (仁義の合): the union where compassion and duty hold each other up. Yi is the vine, the grass, the flower — the supple and the social. Geng is the axe, the sword, the straight-edged decision. On paper, metal should simply cut wood; in this specific pairing the polarity is right, the classical combination takes hold, and the blade and the vine instead become each other's missing organ. The axe finally has something to protect; the vine finally has something worth climbing.

Why the classics call it Benevolence and Righteousness

Alone, Geng's directness can read as ruthlessness, and Yi's flexibility as shape-shifting. Together, each supplies exactly what the other lacks a word for: the sword learns who it is defending, and the vine learns that climbing toward something firm is not weakness but strategy. The classical texts placed this pair among the most moral of the five unions — not because its people are saints, but because the combination forces both to be answerable to someone: Geng to the thing it protects, Yi to the standard it chose to climb. Read in modern terms, this is the pairing of a decisive, hard-charging person with a perceptive, socially fluent one — and it works precisely when each is proud of what the other is.

What each side brings

From the Geng side: for a Geng Day Master, Yi Wood is the Direct Wealth star (正財) — the wealth star, read here as the relationship being the thing Geng's effort is for. Yi gives Geng's blunt strength a beneficiary, which civilizes it faster than any lecture could. From the Yi side: for a Yi Day Master, Geng Metal is the Direct Officer star (正官) — authority and commitment, the trellis the vine was waiting for. Yi experiences this bond as structure that does not have to be resisted: someone whose steadiness frees the vine to flower. Both sides describe the same gift — one gets a reason, the other gets a frame.

Where it rubs

• Delivery damage — Geng's true statements arrive at full force into Yi's thin-skinned discernment; the axe rarely notices the grain it nicked. Criticism that was meant as information lands as a verdict.
• Trellis or prison — a Geng who over-structures turns the relationship into a trellis on all four sides; a Yi who reads every preference as a rule slowly prunes itself into a shape it never chose.
• Public vs private truths — Yi says the pleasant thing in the room; Geng says the true thing. Each can privately regard the other's mode as a character flaw, when the pair actually needs both.

Living the combination

Geng: soften the landing, not the content — the vine can take any truth delivered with a hand under it. Yi: state boundaries in plain sentences, early, before flexibility hardens into resentment. And both: keep externalising the partnership's "why" — this pair runs on the sense that the blade is defending something alive.

The full-chart caveat

A day-master combination is the headline of compatibility, not the whole article: the surrounding charts decide whether this bond is a comfortable trellis or a tight one, and the luck cycles decide whose season it is. Classical texts also distinguish 合 from 合化 — the bond exists long before any transformation conditions are met. The combination tells you the two are linked; the rest of the chart tells you how they live inside it. Check your Day Master — it is free

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