6bb push/fold chart with a 1bb ante
Adding a one big blind ante changes the big blind far more than the small blind. The extra money in the pot gives the big blind a better price, and its calling range jumps to 87% of hands, against 54% without the ante. Facing that, the small blind jams slightly fewer hands than on the ante-free chart, 64% against 68%: it drops the small connected hands, which needed folds, and leans towards high cards, which hold up better against a wide call. It is the clearest case on these pages of the caller's range shaping the jammer's.
Small blind jams 64.1% of hands.
Big blind calls 87.3% 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.