Robin Hood wasn't at the round table

Round Robin takes precedence

A round robin competition is when every team plays every other team.

A variant of round robin scheduling is called selfish round robin scheduling. In selfish round robin, there is a maximum limit on the number of processes that can be placed in the round-robin queue (including the process being executed by the CPU). After that maximum is reached, newly entering processes are placed on a holding queue. Processes in the holding queue do not get any time slice of the CPU. When a process in the round-robin queue completes and leaves the system, the oldest process in the holding queue is allowed to enter the round-robin queue

what is Output Controlled Grant-based Round Robin

?.what for it is used ?.