A tie is the worst possible outcome for us. That puts both of them on 4, which means we'd either need a win or for us to tie while /w/ loses to /int/.
If /w/ win, we go through on a tie or win regardless of the result of the /w/-/int/ game.
If /trv/ win, then a win next game could put us in a GD showdown with /trv/ and /w/ if /w/ beats /int/. A draw against them would mean we need /w/ to draw or lose to /int/. A loss could technically put us through as well, but only if /int/ beats /w/, and even then it would be a GD showdown between us, /w/, and /int/.