Sibling Spacing addon for Anki 2
When you answer a card, it may give the card a boost or a penalty, to prevent siblings showing up with too little (or too much) spacing.
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if a sibling is due within +-15% of the designated due date, give the card an extra 50% boost to space them apart
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if the designated due date results in an interval larger than four times of one of its siblings, give the card a 50% penalty to space them closer together
This addon is geared towards a standard use case (front+back, i.e. two cards per note) and may not work at all well with more siblings.
The boost / penalty values are hard coded at the moment.
This addon may be incompatible with the load balancer addon.