You have to remember that it not only takes into account for your KDA, Warding placements/destroyed, objectives, but also the overall community of the champion you are using. From the looks of it, your S rank game seems to be triggered because you gotten 3 kills and only one death. Whereas your A game had 3 death and no kills. I would assume as well how long the game is also is taken into account.
Well that kinda defeats the purpose of a grading system if you get a high grade for playing sub-optimally aka "securing" kills as support
Sometimes the best way to support your adc is to take some kills but its all situational
One was a 20min game and the other was 51...
Does the grading system take into account match time and objectives? In the second game our team only got 1 dragon lol
Yes it does.
Time length is a huge factor to the grade, you are comparing a 20 min game (I assume a ff) to a 52 min game
Edit: Teemo Top--22/4/4 272 CS 33:37 match S+ (victory) Teemo Top--4/7/4 265 CS 29:42 match A+ (victory) Teemo Top---4/4/12 508 CS 49:47 match S- (defeat) Teemo Jg---16/7/11 67 CS 38:19 match S+ (victory) Teemo Top---3/13/7 328 CS 45:19 match A- (victory)
hmm okay
I only recently started playing again
from what I have seen, the Longer a game goes on, the harder it is to get a high rank (once you reach 50 min it's real hard)
which makes sense cause the amount of games that go that long should be less than shorter games.
like lets say you have to be in the top 10% to get an S rank.
out of 1100 games, 1000 were under 30 and 100 were over 30.
being the top 10 percent in 1000 is alot easier than top 10 percent in 100.
Got 20/3/8 in a long match as nidalee (months ago so not on my match history) and gets B+. (Got baron, drag and everything) Goes 13/5/21 as Poppy in a LONG, LOONG match and gets B. (Baron twice and three drags) Goes 7/5/2 as morgana in an immediate enemy ff match, gets S. (Nothing gotten) Grading system makes no sense.