As the Seattle Sounders prepare for the second leg of their Western Conference Championship series with the Colorado Rapids on Sunday in Commerce City, Colo. (1 p.m. PT; ESPN, 770 KTTH, El Rey 1360AM), here is a breakdown of the aggregate rules and how the Sounders can advance after beating the Rapids 2-1 on Tuesday night.
The conference championships in the Audi 2016 MLS Cup Playoffs are home-and-home two-leg series based on aggregate scoring.
Each team plays at home once, and whichever team has more combined goals at the end of the two-game series advances.