Bottom line: Fewer decks are a secondary benefit. Payout and doubling rules come first.
Calculated benchmarks
With 3:2 blackjack, DAS, no surrender, dealer peek, and the shared split assumptions, the cut-card edge is 0.25532% for S17 and 0.45688% for H17.
Choose the dealer rule
Double-deck strategy differs from the 4–8 deck chart in several doubling boundaries. Use the dedicated S17 or H17 chart below, and confirm that double after split is allowed.
Table check
- Verify 3:2; many single- and double-deck tables pay 6:5
- Ask whether double after split is allowed
- Check double restrictions such as 9–11 or 10–11 only
- Confirm how many hands may be made