That’s not how SBMM works. COD, since MW’s reboot, has used a variation of Microsoft’s TrueSkill V2 matchmaking system. So, every player has a base value, and then a placement variable. Base value is dictated on your overall performance. Since we already know that COD doesn’t use K/D ratio as a SBMM factor, we can assume that it’s your overall win loss. We know it’s not the K/D ratio because this has already been tested and proven to be the case in a YouTube video posted from modern warfare. Using 3 different account ranging from .5, to 2.0, and then a 4.0 k/d account, playing 10 matches the video creator looked up the stats of all of those he played with and against and saw that the k/d ratios were all over the place.
So, whatever COD uses for a base value is yet to be known... but then you have a placement variable. The placement variable we do know for a fact is your performance from your last 5 matches, and since K/D doesn’t matter, I would assume it’s the fact that you won or loss, combined with your score per minute rating.
Therefore, when you queue for a match, COD uses your base matchmaking value, and then uses your placement variable as a way to decide whether you play up a skill tier or down a skill tier. Your placement variable also dictates which range of accounts you’re able to matchmake against.
COD’s entire SBMM system is designed to get every player as close to a 1.0 k/d as possible,
Which is why they don’t use it as a matchmaking factor. Therefore, there are some really good 1.0’s, and some terrible 1.0’s, it all depends on how high up in the SBMM their base matchmaking value is.
The only way to get around the SBMM system is to party up with a bunch of really low skill players, or to bomb a bunch of matches on purpose (called throwing, I don’t know where cod players got this “reverse boost” term from), to lower your base matchmaking value. Or, you can create a smurf account and keep it at a low base value by making sure for every few good games you play, you intentionally throw that many as well.
Comment to UiJHM: It is not (!) true that KD dosnt affect your lobbies directly, this has been proven by Drift0r and Exclusive Ace in MW2019, and the same folks plus JGOD in Cold War. You might want to look their vids up on YT. While there no doubt is a lot of factors that goes into it, (score pr minute being one) the lobbies corresponds directly to your KD.
Most efficient way to cheese the SBMM is having two seperate systems with two diff accounts, one high one bot. Lots of vids on that as well. Thx.