Remove 25 fame rule from " How Plunder works " In Help section...
It says...
-How targets are selected ?
*There must be a fleet in the port you are now OR travelling towards this port OR travelling from this port. All last ports also count so your fleet will be available to 2 ports at any given time. If there is such fleet then you can attack it if:
1.The player owning that fleet, has above 25 fame points.
2.If that fleet has a danger rating of at least 3.
If the above conditions are met, this fleet will become available for you to attack.
I think 1. is outdated and could be changed : As the fame rule is not in order anymore...