20bb push/fold chart with a 1bb ante
Twenty big blinds with an ante jams 60%, comfortably more than twelve big blinds without one. The ante does not merely widen the range at a given depth, it stretches the whole depth ladder: every chart shifts down by roughly four or five big blinds of equivalent stack. That single rule of thumb will get you most of the way if you have not memorised the ante charts themselves.
Small blind jams 60% of hands.
Big blind calls 35% of hands.
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These ranges are solved here rather than copied from a published chart. The solver runs an iterative approximation, so treat the overall jamming frequency as reliable and the exact borderline cells as the least certain part of the grid. Hands on the edge of the range are close to break-even either way, which is why they are also the ones the solver is least sure about.
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.