did lots of thinking to realize that averaging two even numbers between 0 and 100 is the same as adding two numbers between 0 and 50
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i thought that fire emblem calculated percentages by rolling two d50s and adding them, but apparently it actually rolls two d100s and averages them, but turns out these are the same thing
@Lady Well, there's a fencepost issue (can't get 1 as the sum of two d50s) and halves to handle, but it's moderately close, yes.
apparently some newer games use a sine curve instead which feels overly posh