How automatic handicap is calculated?

Giving this a “bump” since I’ve looked everywhere and can’t find anyone even trying to guess what to expect for 19x19 auto handicaps, let alone any kind of official documentation about it. With all the discussion about the importance of accurate ranks for assigning even games, shouldn’t we know this?

The official documentation only says this:

  • Handicap (you can select to prefer or require playing with or without a handicap)

Here’s a handicap tournament that started a few days ago that might have some clues:

In there it looks like most of the matches started with a handicap equal to the displayed rank difference plus 1, such as this 6d vs. 3d getting 4 stones. But then there’s also 3d vs 1d getting 1 stone and 3d vs 1d getting 2 stones.

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