'Officially' not. In XBoard's implementation there also is a modifier 't', (which stands for 'tame'). In combination with p in a non-final leg it limits hopping to friendly mounts, and in combination with c in a final leg it means you cannot capture royalty. I did not implement that in the Interactive Diagram though. I could of course do that, if there is any demand for it. But it would still leave the opposit case unaddressed, where you can hop only over friends. And we are running out of letters...
Perhaps a better solution would be to allow a more general way of restricting modifiers, though use of non-alphabetic characters. E.g. p' could be hop over friends only, and p" hop over enemies only.
'Officially' not. In XBoard's implementation there also is a modifier 't', (which stands for 'tame'). In combination with p in a non-final leg it limits hopping to friendly mounts, and in combination with c in a final leg it means you cannot capture royalty. I did not implement that in the Interactive Diagram though. I could of course do that, if there is any demand for it. But it would still leave the opposit case unaddressed, where you can hop only over friends. And we are running out of letters...
Perhaps a better solution would be to allow a more general way of restricting modifiers, though use of non-alphabetic characters. E.g. p' could be hop over friends only, and p" hop over enemies only.