What payment system this pool uses?

[osnwt]

I am trying to figure out what is the payment system for this pool.

I know few:

• round-based pay per shares (round = 1 block): payment according to shares for single block (no shares per block = no payment).
• round-based pay per shares (round = 1 hour, e.g.): the same, but for hour or other time interval (no shares in an hour = no payment, no sliding window, hour is calendar-based).
• pay per last N shares (round = 1 hour, e.g.): proportional payment per shares submitted in last hour (no shares for more than 1 hour = no payment, use sliding window).

I like first two of them, but it seems pool uses some other. Source says: "calculate shares for each client using last N rounds", but what is a round and what is N? It also somehow checks last round time < 1h, but I still cannot figure out how it works.

I mined a day ago with some hashrate, then pool was offline. Today I started it again and used completely different t-addr for mining. I found that pool sent most of block value to my yesterday miners, and only small part to a new one. Next blocks the share of active miner was higher, but still far from a whole block.

Said so, I see that round is not an hour. It might be N blocks, but what the N is? Or maybe it uses other payment system not mentioned above? Would be good if the payment system was mentioned in the README file or something like that.