the game purposefully tries to balance out your gains in mmr by putting someone of equivalently high mmr on the enemy team.
this is called making balanced games. however, alternatively it could be called forcing 50% win rate. it prevents smurfs from ruining games.
Case in point. ran some tests as a diamond level player in mid silver. over 6-8 games I go up to 90% win rate for the season.
I am maintaining something around 10+ kda, typically wiping the enemy team twice for every death. I also end up with over two times as many killing blows as I have ever gotten in games at my rank.
within 6 games, my mmr is super high. I gain 43 on a win and lose somewhere between 10-15 on a loss.
however, what I would expect if the game was not rigged is that I would just get placed with higher MMR teammates, but that is not the case. instead both teams get one high MMR player and they just balance the games around my high MMR. Ie - instead of getting placed into plat games as one would expect because my MMR is too high, the system places you with other silvers of equivalently crazy mmr, ie other smurfs.
anyway. Iām not saying at all that I canāt climb. obviously when Iām winning 3 times as much than I lose on a loss, itās not a big deal to lose some games. However, the game is very clearly forced to 50/50 when a player can have 10+ kda and more killing blows than heās ever gotten in 1600 hours of playing the game and basically have to carry 1v6 with teammates that are exceptionally bad to balance out your mmr.
I had the first time experience of learning what itās like to have 86% kill participationā¦with 60 elims, 4deaths, and 30+ killing blows.
anyway, if you low-rankers want the truth, this is the truth.
you have two options for climbing.
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make sure to perform well every game, but not so well that your MMR is way overbalanced for your rank.
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outperform every game, accept the enemy team getting smurfs, and just play enough games that your positive win rate and high performance bonus help you climb.
also, if you are outperforming itās easier to climb if you wait a couple days after hard stomping them for 3-4 games. for some reason the gameās estimation of your mmr resets after a few days, probably because itās no longer certain of your skill.
anyway with this I will eventually have my 6th account done. wanted to learn sombra but refused to play with silvers thinking I would just stomp my way into plat within 4 hrs, but no, the smurf detection is real. 10+kda with 4 killing blows every 30 secs does in fact let the game discover you are a smurf.
I sometimes wonder why they donāt increase the SR gains more when someone is outperforming by insane levels, but I"m guessing they are afraid if itās too easy to climb that people will be more willing to throw games to practice widow and the likeā¦ not that it stops them anyway