There is no special notation for automatic side-effect captures, like explosions in Atomic Chess, burning of Fire Demons in Tenjiku Shogi, or Coordinators and Pincher Pawns in Ultima. It is questionable whether there should be. Betza notation is primarily a method for indicating how pieces can move from one square to another. If a locust capture is optional, it can often be described as an extra move possibility with a displacement capture in a non-final leg of a trajectory that makes a detour. But Coordinator captures are not of that type. There it is possible to move to a destination even if there is nothing to capture, but it is not allowed to make the move without capture if capture was possible.
There is no special notation for automatic side-effect captures, like explosions in Atomic Chess, burning of Fire Demons in Tenjiku Shogi, or Coordinators and Pincher Pawns in Ultima. It is questionable whether there should be. Betza notation is primarily a method for indicating how pieces can move from one square to another. If a locust capture is optional, it can often be described as an extra move possibility with a displacement capture in a non-final leg of a trajectory that makes a detour. But Coordinator captures are not of that type. There it is possible to move to a destination even if there is nothing to capture, but it is not allowed to make the move without capture if capture was possible.