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Incorporate error into handicap adjustments #70

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Incorporate error into handicap adjustments #70

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Commits on Mar 31, 2024

  1. Incorporate error into handicap adjustments 

    Change `get_handicap_adjustment` to return a tuple with both rating and error,
where the error comes from:

- ±0.5 for rank differences that aren't (almost) the same as the number of
  handicap stones.
- ±1 for rank difference of 9 (scaled up/down) for large/extreme handicaps.

Also change `Glicko2Entry.copy` to add incorporate the error into the rating
deviation using root-of-sum-of-squares, which is the usual way to combine
standard errors.
    @dexonsmith
    dexonsmith committed Mar 31, 2024
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