We are currently running a recalculation of the Storm League MMR. We have made a change to how Storm League MMR is calculated this time around. Previously, Storm League was treated as a new mode, so everyone started with base (1800) MMR. For this update, to try and more accurately match in-game MMR/Rank, if the calculator finds a player in a replay that has never had Storm League MMR calculations, it will check both Hero League and Team League to find which mode that player has more games in, and use that MMR value as their starting Storm League value. We hope this more accurately matches how Blizzard handled the switch from Hero League/Team League to Storm League. In the future, we may consider introducing a system that does the same thing with quick match or unranked draft if no SL, TL, or HL games are found.
MMR Breakdown Page
SL MMR will take about a week to calculate, during that time, the MMR Breakdown page's graph and table data may look odd. The MMR value found in the middle section of that page that splits out the different rank breakdowns and the MMR value found through the API and Profile page will continue to be the official value until we switch over to the new system.
Rank Breakdown Update
We are planning to increase the number of games required by a player to be included in our backend service that calculates the rank splits. Currently the service includes players who have played greater than or equal to 10 games. To keep in-line with the Amateur series, we are going to be bumping that up to 250 games. This change will allow the breakdowns to more accurately represent the different ranks. See breakdown for ranks below.
- Bronze: 12%
- Silver: 23%
- Gold: 26%
- Platinum: 22%
- Diamond: 12%
- Master: 5%
edit: 9/15/2020 update. We found an issue that caused some replays to not get re-calculated. We have gone ahead and started the process over and expect it to be completed by the end of the week