Hi-Opt II 10 vs A index blackjack
10 vs A Hi-Opt II blackjack: double at +4 (or +8)
The Hi-Opt II 10 vs A index is a true-count switch: basic strategy is hit; at the index you double.
Multi-deck Hi-Opt II 10 vs A blackjack index: +4. If you typed Hi-Opt II 10 vs A +8, that is the pitch / ace-adjusted chart for the same 10 vs A Hi-Opt II blackjack play.
Original Hi-Opt II tables were published for specific decks and rules (Humble / Braun). Do not mix Hi-Lo or Hi-Opt I indices with Hi-Opt II. Casino play is risky; this site is practice only.
Why Google shows both +4 and +8
10 vs A means your hard total is 10 and the dealer’s upcard is an Ace. The index is a true-count threshold. Below it you hit; at or above it you double (when doubling is allowed).
- +4 — typical on multi-deck shoe charts (S17, DAS-style study sets).
- +8 — appears on some pitch-game or ace-side-count-adjusted Hi-Opt II lists.
Hi-Opt II tags 10s at −2 and aces at 0 in the main count, so its true-count scale is not the same as Hi-Lo. Copying a Hi-Lo “10 vs A = +4” into Hi-Opt II without checking the chart is a common leak.
Hi-Opt II index study chart (common multi-deck set)
Use these as a memorization sheet for the plays counters look up most. Insurance and stiff hands sit next to 10 vs A because they travel together in drills.
| Play | Index (TC) | Action at/above index |
|---|---|---|
| Hard 10 vs A | +4 | Double (else hit). Some charts: +8 |
| Hard 10 vs 10 | +4 | Double (else hit) |
| Hard 11 vs A | +1 | Double (else hit) |
| Insurance (dealer Ace) | +3 to +4 | Take insurance |
| Hard 16 vs 10 | 0 | Stand (else hit) |
| Hard 16 vs 9 | +5 | Stand (else hit) |
| Hard 15 vs 10 | +4 | Stand (else hit) |
| Hard 12 vs 3 | +2 | Stand (else hit) |
| Hard 12 vs 2 | +3 | Stand (else hit) |
| Hard 13 vs 2 | −1 | Stand (else hit) |
| Hard 9 vs 7 | +4 | Double (else hit) |
| 10,10 vs 5 | +5 | Split (else stand) |
| 10,10 vs 6 | +5 | Split (else stand) |
“Stiff hands” here means hard 12–16 vs a dealer 2–6 or 10. Stand/hit flips with the true count; 16 vs 10 at 0 is the workhorse.
Hi-Opt I index for 10 vs A
If you searched “hi-opt i” “10 vs a” index: Hi-Opt I is a level-1 ace-neutral count. Multi-deck study charts usually double hard 10 vs Ace at about +4 — same play, different count scale than Hi-Opt II. Do not paste Hi-Opt II’s +8 into Hi-Opt I. Full tags: Hi-Opt I guide.
Drill it, then open the trainer
Learners who stay are the ones who test the number at a table, not only read it. Use the Hi-Opt II system guide for tags and ace side count, then play the free browser trainer (Hi-Lo table) to keep running count and true count automatic. Android APK: free download.