It's a "roller system" on his website, although I havn't got a clue when a session ends, but it doesn't double up every time you lose. It's a little less risk but who knows, I just like his picks and he's been pretty damn not as of late. You might want to ask Pepi when a session is considered a loss.
All I can really tell you is whats on his site. Like a normal chase system you risk 32 units if you lose 4 or something but with his you only risk 8. It's pretty legit, he's been hitting like crazy all month so hopefully he keeps it up. I keep checking his site for his NBA release tonight, I'll post for n e who cares