Does using all 4 answer buttons make FSRS more accurate?

Anki FSRS
1

I tried searching for this but couldn’t find a clear answer. The only discussion I found was a single Reddit comment.

For someone using FSRS, is the following the intended way to use the buttons?

Again = I forgot the card.

Hard = I eventually got it right, but it took a while or required significant effort.

Good = I recalled it normally.

Easy = The answer came instantly and the card felt too easy.

2

Yes, that 's right! However for the best usage, only Good and Again

Q2: I only use Again and Good, will FSRS work fine?

A2: Yes. In some cases, FSRS may even be more accurate if you only use Again and Good.
Frequently asked questions about FSRS - Anki FAQs

3

Consistency in grading is among the most important factors. Your rubric matches the standard grading advice – Studying - Anki Manual .

But the balance will always be between –

  • Providing FSRS with more varied data. This is an obvious benefit of 4-button grading.
  • Grading your cards consistently and without much effort. Folks who struggle with deciding when to grade Hard or Easy often prefer 2-button grading for this reason.

If you’re looking for more: The Button War will never end.