Define the subject, then compare candidates

Keep the selection separate from the outcome

In Liuyao, the Useful God (用神) identifies the subject or line chosen as the main focus of a question. The literal English phrase “useful god” can be misleading: it is not an instruction to choose the most reassuring label or the strongest-looking line. Nor is it interchangeable with the same term in Bazi.

A selection should be explainable before an interpretation of success or failure is written. Record what the question concerns, which traditional category is being used, and which lines fit that category. If two lines remain plausible or none is visible, preserve that state rather than presenting an unsupported unique answer.

“Will the application go well?” might concern delivery of a document, receipt of resources, or another person's cooperation. Those are different subjects. Narrowing the question does not manufacture certainty; it prevents the focus from quietly moving between subjects during the explanation.

The Useful God chapter of Zengshan Buyi includes documents and written agreements under Parents, and material goods under Wealth. It also lists traditional ranges for Siblings, Officials/Ghosts, and Descendants. These are conventions of the method, not ordinary-language keyword matching. A document mentioning a sibling does not automatically become a Siblings line if the object under discussion is the document itself.

The historical lists also contain social roles and assumptions that should not be imposed on modern people without explanation. For a modern subject with several reasonable mappings, identify the chosen convention and acknowledge the alternatives. Do not pretend that an old text explicitly classified every contemporary institution or device.

Two supplied exercises produce different candidate states

Our first exercise supplies Qian and asks only about a document. Qian belongs to the Metal palace. The relevant assignments are Dragon (辰) Earth at line 3 and Dog (戌) Earth at line 6. Each generates palace Metal, placing both in the Parents category. The document convention therefore yields two visible candidates.

Our second exercise supplies Gou and uses material goods as the subject. Gou also belongs to the Qian Metal palace. Its lower Xun trigram receives Ox (丑) Earth, Pig (亥) Water, and Rooster (酉) Metal; upper Qian receives Horse (午) Fire, Monkey (申) Metal, and Dog Earth. There is no Wood branch among those six visible assignments. Since Metal controls Wood, the Wealth category has no visible candidate here.

These are constructed selection exercises, not actual consultations. No calendar or complete movement information has been supplied, and neither exercise predicts delivery or acquisition. For the calculations behind the categories, see Najia and the relative labels.

Open the full-size diagram

Original BaZiFlow candidate comparison. Counts describe visible chart assignments, not the number of real objects or an outcome.

Repetition needs a reason for preference

Qian's line 6 is also Self, but that positional marker does not by itself erase the Parents candidate at line 3. Self and Response placement is a separate operation from choosing the question's focus. Likewise, two Parents entries do not establish that there are two actual documents.

Zengshan Buyi includes a worked case with several Parents entries and gives Dragon's alignment with the month as a reason for selecting it. That case includes calendar and change information, including a transformed Goat (未) Earth line. It must not be reduced to the claim that the primary Qian hexagram has three visible Parents lines, or that line 3 is always the answer whenever Parents repeats.

We borrow only the methodological point: preference needs explicit conditions. Our supplied Qian exercise lacks those conditions, so both candidates remain listed. A school-specific priority rule should be named with its scope, not applied retrospectively because one candidate gives the desired story.

Visible absence has a limited meaning

The incomplete-category verses in Bushi Quanshu include Gou among hexagrams lacking visible Wealth. That agrees with the six-branch calculation above. Its discussion of hidden lines also recognizes that an absent useful category requires further handling.

“No visible Wealth line” does not mean that the person owns nothing, that an object does not exist, or that acquisition is impossible. It is a statement about this layer of the chart. Changing Rooster Metal into Wood or relabeling Siblings as Wealth would not resolve the absence; it would corrupt the original assembly.

A subsequent hidden-line procedure must state which text and rule it follows. This article does not combine fragments from different traditions into a convenient shortcut. It stops at identifying the missing visible category so that the next step can be performed and checked on its own terms.

Freeze the focus before comparing later conditions

The weather section of the Golden Strategies discusses Parents and Wealth in relation to rain and clear weather, followed by seasonal and phase considerations. Even a broad topic can therefore contain different attributes of interest. A single keyword is not a universal selector for all questions in that topic.

Keep a compact selection record: the original subject, the category convention, the full candidate list, the selected line if justified, and the unresolved conditions. This is a modern recordkeeping recommendation, not a claim that the ancient texts prescribed this exact form. If the question later changes from a document to its sender, record a new subject rather than silently reusing the earlier selection.

Only then proceed to day, month, and strength or other relationships. Those considerations should evaluate the stated focus, not retroactively redefine the question to fit a preferred result. A resolved selection is still not evidence that a prediction is true; an unresolved selection should remain visibly unresolved.