If u win a game by 13 -7 , and next game u lost by same u know why there lots of Smurfs and if u lose 13-3 , u have to derank or u have to play with Lower ranks and yea u can also lose 6th in row and go to plat 2 from d1 and win 1000 game and still u can't rank up . That's how it works specially for cypher or some low frag capable agent