Learn
A strategy reference for serious blackjack players. 340 hand-by-hand strategy pages, rule-variation analyses, and dedicated pages on the math behind counting.
Practice everything in this guide against millions of hands.
The 21simulator.com engine runs your exact rules so you can evaluate your optimum blackjack strategies.
Run Simulation → The 21simulator.com engine runs your exact rules so you can evaluate your optimum blackjack strategies.
Strategy
The full hand × upcard matrix: hard 5–20, soft 13–20, pairs 2-2 through A-A, against every dealer upcard. Each page shows the correct basic-strategy play with a live rule-aware widget.
Basic Strategy Chart
View Basic Strategy Chart → Every hand × upcard as a color-coded grid. Each cell links to its detail page. The fastest way to navigate the full matrix.Deep dives
- Hard 16 vs Dealer 10 → The closest decision on the chart. Full EV breakdown + Illustrious 18 deviation.
- Pair of 8s vs Dealer 10 → The textbook case for splitting a bad hand into two better ones.
Featured strategy pages
Counting & Advanced
The math behind count-based play — what to track, how to convert it, and which strategy deviations it justifies.
Rule Variations
How specific rule changes move the house edge and which basic-strategy decisions flip as a result.