DigitalMechanic

Splitting it up worked better for me. I kept getting soft 18 and the pair splits muddled, so I drilled those separately for a few days, then started running random hands with no chart. I’d say the play out loud while making tea, sometimes caught myself getting the same one wrong twice. Cramming the full chart in a weekend would probably leave it familiar, not automatic. Mixed hands without looking is the bit that finally made it stick.