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Dota 2 players found their matchmaking score erased as Valve introduced on August 6 an experimental matchmaking system developed towards the team play core aspect of the game. The MMR numbers are erased but the Medal earned so far in the season stays in place. The new update focuses on two big aspects: the removal of the two types of MMRs, party and solo and the addition of role MMR.

While Valve are aware that the first concept will raise the most controversy in the community, the latter is actually something that the players have been hoping to see implemented for a long time now.

 Extract from Valve’s announcement:

“For the correctness of the MMR aspect: We recognize that there is a tradeoff here on the mmr data quality if the match has solo mmr numbers with party mmr numbers, however we feel that the impact of that data noise is much smaller than even we initially considered it to be early on and generally with how it is discussed online. Most of the issues related to this we think we can solve with better algorithms. Another common case is playing with a friend who has a higher mmr than you, expecting that it will cause your mmr to go higher. While that has been at least partly true in previous matchmaking system iterations, our most recent version does a fairly good job of addressing this. We have enough data to form matches that cause you to have an even chance to win by carefully choosing the opponents that have a similar makeup. At a base level, we think mathematically we are able to have high confidence that playing with a friend will not have a material effect on your average mmr value with a properly balanced matchmaker.”

Instead of having solo and party MMRs, players will now have Core and Support MMRs.To make it possible, Valve have moved the Ranked Roles from Dota Plus feature to the base ranked matchmaking. Starting today, before queuing for a ranked match, players will have to choose the role(s) they want to play. The option gives more than once choice and it actually spans across all five roles on the team, Carry, Mid, Offlane, Soft Support and Hard Support.

This experimental MMR system update is part of the Summer Scrub update and will stay in place until the end of the current season. Valve will open a feedback channel on the new system sometime. after The International 2019.

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