Read the intersection.
Your hand is the row. The dealer’s upcard is the column. Face cards use the 10 column.
Interactive reference
Blackjack Strategy
Choose the rules on the felt, then tap any play to see the decision in plain English—and the expected-value math behind close hit-or-stand calls.
Soft 17 rule
Double after split
Late surrender
How to read it
Your hand runs down. Dealer upcard runs across.
H Hit
S Stand
D Double
P Split
R Surrender
Rules move the edges.
Switch H17, DAS, or surrender above and the affected cells update instantly.
Train past the chart.
The reference tells you the play. TwentyOne drills it until you no longer need to look.
TwentyOne on iPhone
Drill the play until it is automatic.
Instant feedback on every decision, a full basic-strategy chart for your rules, and Hi-Lo drills when you are ready to count.
