Blackjack Basic Strategy Explained

Overview

Blackjack basic strategy is the set of mathematically optimal decisions for every possible combination of player hand and dealer upcard. It was first derived by Baldwin, Cantey, Maisel, and McDermott in 1956 and later refined by Edward Thorp. A player following basic strategy perfectly faces a house edge of around 0.5% on liberal rule sets — the lowest edge of any table game in the casino.

The Math and Mechanics

Basic strategy is not intuition; it is the output of billions of simulated hands. Key decisions include:

• Hit vs stand. Always hit 16 vs dealer 7-ace. Always stand on 17 and above. Stand on 12 vs dealer 4-6.
• Doubling. Double 11 vs any upcard except ace. Double 10 vs dealer 2-9. Double soft 18 vs 3-6.
• Splitting. Always split aces and 8s. Never split 5s or 10s.
• Surrender. Late surrender 16 vs dealer 9, 10, ace, and 15 vs 10 when available.

Rules matter. Dealer stands on soft 17 (S17) is worth about 0.22% to the player versus H17. Double after split (DAS) adds ~0.14%. Blackjack paying 6:5 instead of 3:2 costs roughly 1.4% — a crippling rule that turns a beatable game into a tourist trap.

How To Apply It

• Print or download a basic strategy chart matched to your casino's exact rule set.
• Memorize hard totals first, then soft totals, then pairs.
• Practice with a free trainer app before risking real money.
• Avoid side bets — insurance, lucky ladies, perfect pairs all carry 5%+ house edges.
• Walk away from 6:5 tables. Play 3:2 only.

Common Mistakes

• "Playing a hunch" on a 16 vs 10.
• Standing on soft 17 because the total looks good.
• Taking insurance — a -7% EV bet in a full-shoe game.
• Splitting 10s because the dealer is weak.

Bottom Line

Basic strategy is the closest thing to a solved game in the casino. Memorize it, stick to 3:2 tables, and treat any deviation as a cost. Set a loss limit before you sit down and honor it. Help with problem gambling is available through 800GAM and ncpgambling.org/chat.