When invoking an aspect in Fate Core for a reroll, and the second roll is worse than the first, can you go with the first roll? Do rerolls in Fate work like rolling with advantage in D&D, or are you stuck with the second roll without spending another Fate point?
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Once you reroll you're stuck with the new result. You don't get to pick the highest of the two; the previous roll's gone. It's for this reason the authors recommend only rerolling on a –3 or –4 in a sidebar on Fate Core page 68:
The simple version of the odds at that point is that your chance of rolling –3 or –4 (again) is so vanishing small (~6%) you're nearly guaranteed to at least upgrade to –2, and the odds of getting at least a +0 aren't bad (~61%). Being able to choose between the two sounds like a viable stunt though, or at least a half-stunt effect. Here's how I might handle it:
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