Button Near-Bubble Opening Range at 15bb (MTT ICM, 8-Max)

Near the money, survival is worth more than chips. Busting one spot before the bubble bursts means zero, while folding into the money guarantees a cash, so every marginal spot is taxed by the risk of elimination. The result is a range built around fold equity: at 15 big blinds you are not raising to build a pot and play postflop, you are raising to take the blinds and antes uncontested, with the shortest of your continues going all-in outright rather than opening to a size you would have to fold to a re-jam.

This chart comes from a realistic bubble table where stacks range from under 10bb to 50bb, not a clean equal-stack lab. That matters: the covering big stacks behind you can call off lightly because busting you costs them nothing, so your looser bluff-jams lose value and the range leans toward hands with real showdown equity. The exact border of what jams versus folds shifts with the stacks behind you, which is why drilling the full ICM tree beats memorizing a single chart.