M-200% №11

Is the lower bracket 1/64? Meaning, if you're in 1/64, you need to lose one game to be eliminated?

1/64 is a stage in the upper bracket - if you win, you move to 1/32 of the upper bracket - and so on, with each win, you advance through the upper bracket up to the grand final.

Those who lose fall into the lower bracket - the stages there are called:

Round 1 - Round 2 - etc., whoever loses in the lower bracket leaves the tournament.