@BartvanIngenSchenau The problem is really the organization of the various components and their interaction. Given the one answer I received, I have got some ideas and will see how it works.

@Ewan The app will just record progress of the match (operated by a user). I know all the logic that will go into scoring but trying to organize the objects in best way and how to main state of the match that should support do/undo functionality as well (Command Pattern).

To add, I found this wikipedia article talks about this dependency a service in the context of dependency injection.

I think context object is a thing of its own, the shell where strategy is used is not really the context. This is what adds to the confusion.

The line Realize that the frame pointer will need to be stored and restored with subroutine calls that modify it. is not quite clear what that means