It counts last 2n shares. So if you mine in the begining of the block, but then you stop, and the block takes longer than 100% of expected work, it will start forgetting the first shares. That is the point of PPLNS - to make it harder for pool jumpers.
It counts last 2n shares. So if you mine in the begining of the block, but then you stop, and the block takes longer than 100% of expected work, it will start forgetting the first shares. That is the point of PPLNS - to make it harder for pool jumpers.