Perfect 21 — blackjack basic-strategy trainer
Perfect 21 grades every blackjack decision you make against basic strategy the instant
you make it, and shows the expected value of each play you could have made instead. It
derives the strategy chart from your exact table rules — deck count, soft 17, doubling,
double after split, surrender, dealer peek, and whether blackjack pays 3:2 or 6:5 —
rather than shipping one hardcoded chart.
It also teaches card counting (Hi-Lo running count, true count, bet spread and the
Illustrious 18 deviations), builds a flashcard drill out of the hands you personally get
wrong, and includes a house-edge calculator and a strategy simulator.
There is no real money anywhere in it. Chips are valueless practice tokens and cannot be
bought. This is a math tool, not a casino.
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