Hi,
for the (custodial) ludeme, neither it's default usage "(custodial)" nor filling in the values mentioned here manually seems to have the intended effect (removing a flanked piece). Aside from that, both of these methods seem to have different effects: "(custodial)" sometimes removes pieces with rules I don't quite understand, while the filled in version never removes pieces at all? A demonstration .lud with which I tested this on Ludii 1.3.5 can be found here.
for the (custodial) ludeme, neither it's default usage "(custodial)" nor filling in the values mentioned here manually seems to have the intended effect (removing a flanked piece). Aside from that, both of these methods seem to have different effects: "(custodial)" sometimes removes pieces with rules I don't quite understand, while the filled in version never removes pieces at all? A demonstration .lud with which I tested this on Ludii 1.3.5 can be found here.