You must specify royal=1 , not royal=P . I suppose using a list of royal types similar to pomoChoice would be a better way to do it; currently you would have to specify a number of royal= parameters if you want to have multiple royal types. (But it is of course very unusual that you would.) Perhaps I should add a parameter royalTypes that works that way, which is then interpreted only after all pieces have been defined, and deprecate the royal parameter.
You must specify royal=1 , not royal=P . I suppose using a list of royal types similar to pomoChoice would be a better way to do it; currently you would have to specify a number of royal= parameters if you want to have multiple royal types. (But it is of course very unusual that you would.) Perhaps I should add a parameter royalTypes that works that way, which is then interpreted only after all pieces have been defined, and deprecate the royal parameter.