max

The max filter takes two or more numeric arguments enclosed in parentheses. It returns the maximum of the arguments:

  x=max(#Q #R #B)

The max filter matches a position if at least one of its arguments match the position.

Examples

The max filter is used in queenpawnpinecho.cql. The filters there:

  L=lca(source target)
  max(distance(source L)
      distance(target L))>= 4

is used to make sure that either the position named source or the position named target are a distance of at least 4 from their latest common ancestor.