Doubling adds a second equal wager, gives you exactly one more card, and then ends your action on that hand. The extra wager is useful only when your starting total is strong enough against the dealer.
The three hard-total rules
- Hard 9: double against dealer 3 through 6; otherwise hit.
- Hard 10: double against dealer 2 through 9; hit against 10 or ace.
- Hard 11: double against every dealer upcard, including ace, under this H17 profile.
If doubling is unavailable because the hand has more than two cards or the simulated bankroll cannot fund the extra wager, use the chart’s fallback action. For these hard totals, the fallback is hit.
A double is a one-card commitment, not a request to keep drawing.
Table rules matter. This app supports double after split, but a different table can change pair and post-split decisions.