The format for 'linkto' is:
   https://www.formgrids.info/linkto/?t=type&d=yyyy-mm-dd&r=n&v=Venue&c=Country

 where

   type is
 rr for Race Result
 rc for Race Card
 ri for Race Index
 ac for All Cards

   yyyy-mm-dd is the date of the race
      or use {{next}} for system to find the next date

   n is the race number

   Venue is the Race Track or Venue name

   Country is the Country Key, e.g. ZW (optional; default=ZA)