Advancement Scenarios: A look at the second leg of the Western Conference semifinals

FC Dallas' 1-1 draw with Seattle in the first leg of the Western Conference semifinals Sunday night gave the Sounders a slight edge heading into next Monday's second leg at CenturyLink Field. Seattle's advantage is due to the new away goals tiebreaker for this year's postseason. You can get a thorough explanation of the away goals rule and all the other intricacies of a two-leg playoff series HERE. Here are the advancement scenarios for both clubs depending on the result of the second leg:

Leg Result
What It
FC Dallas win
(by any margin)
FC Dallas advances
Seattle win
(by any margin)
Seattle advances
0-0 draw Seattle advances
(away goals tiebreaker)
1-1 draw Two 15-minute extra time
periods will be played.
If still tied, match will be
decided by penalty kick shootout.
Any other draw
(2-2, 3-3, 4-4, etc.)
FC Dallas advances
(away goals tiebreaker)