20bb push/fold chart with a 1bb ante
Twenty big blinds with an ante jams 49% of hands, more than the ante-free chart does at fifteen. The ante does not merely widen the range at a given depth, it stretches the depth ladder, and the stretch grows with the stack: at ten big blinds an ante makes the jam play like an ante-free stack less than two big blinds shorter, at twenty like one more than five big blinds shorter. If you have not memorised the ante charts, reading the ante-free chart for a shorter stack gets you most of the way, and the deeper you are, the shorter the stack to read.
Small blind jams 48.9% of hands.
Big blind calls 32.6% of hands.
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These ranges are solved here rather than copied from a published chart. The solver uses the exact all-in equity of every pair of hands rather than a simulation, and the solved ranges are checked so that neither player could gain as much as a hundredth of a big blind by playing any single hand differently. Hands on the edge of a range are close to break-even either way, so they are where charts from different solvers most often disagree, and where a small difference costs least.
See every depth at once on the full push/fold chart tool, or drill the same decision with tournament ICM pressure applied in the ICM push/fold drill.