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I had a similar experience, after getting into silver league in 1 reset with 3-2, i slipped on another getting 2-3 but still managed silver league. Just throwing a guess here but it could be based on points for the game seen in the score screen of a game. Also, seeing as SC2 is also from blizzard, it might follow the WoW arena in which you are assigned hidden rank/points for fairer matchmaking but its unlikely as the points will most slightly be resetted and should be completely unneccessary since there's another point system in place.
I had a similar experience, after getting into silver league in 1 reset with 3-2, i slipped on another getting 2-3 but still managed silver league. Just throwing a guess here but it could be based on points for the game seen in the score screen of a game.
Also, seeing as SC2 is also from blizzard, it might follow the WoW arena in which you are assigned hidden rank/points for fairer matchmaking but its unlikely as the points will most slightly be resetted and should be completely unneccessary since there's another point system in place.