Calculated Property : Function : Compare

I’m having trouble finding how the Calculated Property : Function : Compare works?

I really want to compare 6 global values and return the lowest one so I can move the next card to that point.
But I’m not sure how compare( AAA, BBB) is supposed to work?

It is likely I’ll be doing:
If( A<B && A<C && A<D && A<E && A<F, A,
If(B<C && B<D && B<E && B<F, B,
If(C<D && C<E && C<F, C,
If(D<E && D<F, D,
If(E<F, E,F) ) ) ) )

(And repeating this calculation for each climactic zone.)