So here we have the game I just won with Kha'Zix.... http://imgur.com/a/REp7O And here is the game I won with Hecarim a couple weeks ago.... http://imgur.com/a/XoXl3 Single handedly hard carried both of those games and screwed of of an S grade. I'm sure this has happened to some other people. The Poppy in the Hecarim game got an S by the way.
How long did the Kha'Zix game last? You blocked it out with the yellow underline.
The system rates you based on how good you did compared to other people on the same champion in the same role, and for all roles except support, cs is a pretty big factor. I think I found your problem: 71 cs in the Kha'Zix game, 114 in the Hecarim game in 30 minutes.
Last season when armor pen Lucian was broken, I had a game where I went 20/0/14 I think the score was with a very poor cs. Enemy team surrendered at 20, I got an A+. Why? Probably how little cs I had. Work on farming a bit more and you'll be getting those S ranks.
your cs is kinda low, if you want an S, you need to powerfarm
