Background: Spaced repetition is scientifically proven to significantly improves long term memory.
Challenge: current drills return hands and board textures at random. This leads to simple and complex scenarios occuring at the same frequency.
Proposal: implement a “spaced repetition” feature that allows users to select the difficulty after each answer. The same scenario will then reappear in subsequent days or weeks based on the difficulty selected (more difficult = reappear sooner).