Ante

Tournament level, blinds 100/200, a 25 ante, nine-handed. Before anyone acts the pot holds 300 from the blinds plus 225 from the nine antes — 525, nearly double what the blinds build alone. Folded to you in the cutoff with Q-7 suited, a raise to 450 risks 450 to pick up 525 in dead money, so it only has to work a little under half the time to turn a profit. Strip the ante and that same raise fights for a 300 pot and now needs to work three times in five — Q-7 suited stops being a clear steal.

That's the job of the ante: it taxes every hand dealt, not just the two blind seats. Folding gets more expensive, stealing pays better. Late in tournaments antes often outgrow the blinds, which is why good players open wider and defend wider once they kick in. Sitting back for premium hands bleeds a stack faster than the blinds ever could alone.

The beginner mistake is treating the ante like background noise instead of a cue to loosen up — same tight range as the ante-less levels, blind to how the extra dead money shifts the math on marginal steals and marginal calls. The other slip is a big-blind-ante structure, where the big blind posts one lump sum instead of everyone chipping in. Miss who paid what and your pot odds are off before you even see a flop.