Why GNWL ticket has the best chance of Confirm ticket

There is the rule that say GN WL ticket has good chance of getting confirmed over the other like PQWL and RLWL Ticket.

                             

This is because the tickets available from other quota like Ladies, Lower birth, Defense and if tatkal ticket quotas are provided first to GNWL ticket passenger as they are traveling in long route. And if still some seats are available after allotting to GN WL ticket holder they are transferred to PQ WL passenger.   



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Why RL WL Ticket has less chance of Confirmed reservation