Where the plays come from
Each card is the strategy its trainer teaches, from our own math. "Exact" means counted over every possible deal or roll; "model" means our blackjack solver; "estimate" means a simulation or sampled solve. The house edge assumes you follow the card and the rules printed on it. Casinos change rules and paytables, so check the felt. How our odds are calculated.
Rules on using a card at the table vary by casino, so ask the dealer before you bring one out, and keep it clear of the cards and chips.