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Welcome! If you ever wondered how the StarCraft 2 ranking  and matchmaking system workes, you've come to the right page! I do go out of my way to create a whole page dedicated to this, since the system is vastly complicated and confusing. I tried my best to explain it and as such, I devided the system into bits and pieces to better explain the bases of it. Please click on the part you are interested to learn about, althogh, if you want to fully understand it, please read all of the articles for a more complete picture of the StarCraft Ranking System(SCRS). 

Bonus pool

MMR

Season transition

Activity

Leagues

Mid-season demotion

Placement Matches

Ratings

Promotions/demotions

Leaving League

Ranked vs Unranked

Leveling

ladder points

StarCraft 2 Ranking System

Building blocks of SCRS

MSD
Leagues
Activity
Bonus Pool
MMR
Season Transition
Placement matches
Rating
Leveling
un/ranked
Building Blocks

The bonus pool is a reserved sum of points that accumulate over time (see table below) for all player. This works as a decaying system to separate active players from inactive ones. The mechanics of the bonus pool is as follows: when a player wins he/she will be awarded from the bonus pool points the same amount of points as he/she earnd for the win (i.e. win=10 + 10 from BP =20) doubling the earnd points , but loosing will only deduct points from the BP (i.e. bonus pool= 7, deduction for loosing=10 then -7 from BP and -3 from ladder points). Both awarding and deducting will continue until there is no more bounus pool points left, then ladder points start to fluctuate. Because BP points are granted constantly throughout each season, it can determine who is more active (by spending BP) thus assuming who might be more skillfull. To calculate thisthe system uses the following equation: (Ladder points+Bonus Pool points)-total Bonus Pool points=Adjusted points. The tota BP points can be calculated from the table below: (League and game type) x number of weeks has passed in the season.  A player who spends his/her BP points is more likely to be promoted to the next league.

 

Bonus Pool Table

 

Points displayed are a weekly calculation.

 

 

                               Grandmasters     Master      Diamond     Platinum         Gold            Silver      Bronze

 

           1v1and random team:                180               180            104.4          104.4            104.4            104.4       104.4   

 

           Arranged 2v2 team   :                120               69.6            69.6            69.6              69.6              69.6         69.6    

 

           Arranged 3v3 team   :                 60                34.8            34.8            34.8              34.8              34.8         34.8    

 

           Arranged 4v4 team   :                 60                34.8            34.8            34.8              34.8              34.8          34.8   

 

Bonus Pool

The bonus pool is...

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