Blackjack Rule Impact Reference
A compact reference showing how common blackjack rules change player expected return under a stated baseline.
The payout on blackjack is usually the first rule to check. Moving from 3:2 to 6:5 is approximately a 1.39 percentage-point reduction in player return under the cited benchmark—far larger than many smaller rule differences.
Reference baseline
The comparison below uses Wizard of Odds rule-variation analysis relative to an eight-deck S17 game with double on any first two cards, DAS and splitting to four hands. Effects are approximate and interaction between rules means they should not be blindly summed into an exact house edge.
High-impact rules
| Rule change | Approx. change in player return | Direction |
|---|---|---|
| Blackjack 6:5 instead of 3:2 | −1.39 percentage points | Worse |
| Dealer hits soft 17 instead of stands | −0.22 pp | Worse |
| No double after split | −0.14 pp | Worse |
| Late surrender vs 10 | +0.07 pp | Better |
| Resplit aces allowed | +0.08 pp | Better |
| Six decks instead of eight | +0.02 pp | Slightly better |
Do not add blindly
Rule effects can interact because optimal strategy changes with the rules. Use this table to understand magnitude and direction; use a combinatorial calculator for an exact full-ruleset edge.
A practical reading order
Check blackjack payout first, then S17/H17, doubling restrictions, DAS, surrender, split limits, ace rules and dealer hole-card procedure.