Ranking System

[ggggggggkkkkkk]

Does anyone know how the ranking system works? Obviously beating a higher ranked opponent will move you up and vice versa but are there any other factors that go into the hidden ranking? Specifically how many turns the games last. Like, will losing in 10 turns lower your ranking more than if you lost in 100 turns. I was just wondering if giving up when you know you will eventually lose would hurt your ranking more than if you dragged it out as long as possible, which is never fun for either person.