The Ultimate Cheat Sheet on 롤듀오
https://www.evernote.com/shard/s519/sh/89e84493-ef8d-4645-9798-1f2d2bbf012f/20fd509450b8cef41f7ebd132d62ae91
The principle of rakeback was released not so long ago, but it really received acceptance quite quickly and nowadays it is actually implemented all via the internet.