can you explain me on this example why one game is "s" and another "a"?
i am genuinely curious
checking through my match history i found this little puzzle and i still cannot guess it fully
i got "s-" for this game: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2952287022/40508454?tab=overview
and got "a" or even "a-" (definitely not "a+") for this: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2951080454/40508454?tab=overview
for me they look exactly the same, the same champion, kda, farm, kill participation, wards... the "a" grade one is possibly even better, i got 50% of team kills there instead of 33% and had far better damage than anybody on my team while in the "s" grade one i did less damage than yasuo, also in the "a" grade game i placed 2 more wards; i had 1 kill and 1 assist less in the grade "a" game but then, i also got "s-" for 9/0/0 ahri game before that (on a loss too), so 9/0 is ok for "s" on ahri...
possibly it's still farm, the grade "s" game had it 134/22:24 = 5.98 cs/min and the grade "a" 127/24:10 = 5.25 cs/min which noticeably worse... (the 9/0/0 game had it 6.36 cs/min)
p.s. alternatively it can be building takedowns, i got 2 towers and an inhib in the "s" game and nothing in the "a" game, but i still think it's likely cs/min