You're dealt a pair of 6s. The dealer shows a 6. Split or play it as one hand? Basic strategy answers:
| Split ← | +0.1079 |
| Stand | -0.1537 |
| Hit | -0.1705 |
| Double | -0.3411 |
| You bust on the next card | 30.8% |
| Dealer 6 busts | 42.3% |
Split is not close: it beats Stand by 0.2616 per unit. Getting this one wrong costs $2.62 on a $10 bet, every single time. Across the 340 situations in this chart it ranks 131st by expected value — better than 209 of them, worse than 130. Expected value is per unit staked, computed for multi-deck, dealer stands on soft 17, double after split allowed. The model and the code are published as data.
Against a dealer 6 (42% bust chance), splitting 6s turns one mediocre total into two playable hands while the dealer is vulnerable. With double-after-split allowed, you also keep the option to press each new hand — that's where the split profit comes from.