Condition-Group Maths

Condition groups can compute numbers, not just combine tests. Alongside and, or, not, and count, a group can be an arithmetic operation (add, subtract, multiply, divide, modulo, power, min, max) or a comparison (greater, greaterOrEqual, less, lessOrEqual, equal, notEqual). The conditions inside contribute the numbers their queries count, the group combines or compares them, and the result gates whatever the group sits on, like any other condition.

Rough edges

This is honestly a clunky tool: assembling anything beyond a single comparison is fiddly, and the result is hard to read back. Use it for simple computed checks and keep a comment nearby.

Worked example: "no more X than Y"

Rule: "You may not select more Poxwalker units than Plague Marine units."

1. On the relevant entry, add an error modifier with the text "You may not select more Poxwalker units than Plague Marine units."
2. Gate it on a condition group of type greater containing two conditions:
   • the count of Poxwalker selections in Roster
   • the count of Plague Marine selections in Roster

The group compares the two counts and the error appears only while the first exceeds the second. The same shape handles ratios and derived values: compute with an arithmetic group, compare with a comparison group, nest as needed.

Notes

• Keep computed logic simple; multi-step formulas are possible but hard to follow. If a rule needs elaborate maths, it may not be worth forcing into the data; see Known Limitations.
• Local condition groups and the before condition combine well with this for position-dependent rules; see Conditions.