(version 20200610)

(condition (expression "A.type == 'Pad' && B.type == 'Pad' && (A.onlayer('B.Cu'))") (rule "pad2pad_clearance_back") )

(rule "pad2pad_clearance_back" (type "clearance") (priority 1) (severity error) (min "1mm") )
(rule "default" (type "clearance") (priority 0) (severity error) (min "0.2mm") )