Wong Halves 10 vs A index blackjack
Hard 10 vs dealer Ace: +4 halves · +8 if tags are doubled
Basic strategy is hit. The Wong Halves 10 vs A blackjack index is when you double. On Stanford Wong’s halves true-count scale that is typically +4.
Many counters double every tag (5 = +3, 10 = −2) so they never add 0.5. Then they must double the index too: 10 vs A becomes +8 on that integer scale. Mixing a halves-scale +4 with doubled tags is a common leak.
Wong Halves (often misspelled wrong halves) is from Stanford Wong’s published work. Indices follow your tag scale. Casino play is risky; this site is practice only.
Halves scale vs doubled-integer scale
Wong Halves tags aces and tens at −1 (aces are in the main count — no required ace side count). That makes its true-count scale closer to Hi-Lo than to Hi-Opt II. A Hi-Opt II 10 vs A +8 pitch chart is a different system; do not paste it into Wong Halves unless you are on the doubled-tag scale and the play is this same double.
| Scale you are counting | 10 vs A index |
|---|---|
| Standard halves (2 = +0.5, 5 = +1.5) | +4 |
| Doubled integers (2 = +1, 5 = +3) | +8 |
Wong Halves index study chart (halves TC scale)
If you use doubled tags, double every number in the Index column.
| Play | Index (halves TC) | Action at/above index |
|---|---|---|
| Hard 10 vs A | +4 | Double (else hit). Doubled tags: +8 |
| Hard 10 vs 10 | +4 | Double (else hit) |
| Hard 11 vs A | +1 | Double (else hit) |
| Insurance (dealer Ace) | +3 | Take insurance |
| Hard 16 vs 10 | 0 | Stand (else hit) |
| Hard 16 vs 9 | +4 | 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 | +3 | Double (else hit) |
| 10,10 vs 5 | +5 | Split (else stand) |
| 10,10 vs 6 | +4 | Split (else stand) |
Practice
Wong Halves system guide · Omega II 10 vs A · Hi-Opt II 10 vs A +8 · Free trainer