Soft 18 (A,7)
Ace-seven is a soft 18: the ace still counts as 11, so a hit cannot bust you in one card. That is why basic strategy is more aggressive here than it is with a hard 18. The exact play depends on the dealer’s upcard and on S17 vs H17. Educational, 21+, not gambling advice.
Under default six-deck S17 DAS, no surrender, the row is:
| Rules | Play | Expected values (units) |
|---|---|---|
| A,7 vs 2 | Stand | Stand +0.124001, double +0.120980, hit +0.063289 |
| A,7 vs 3, 4, 5, or 6 | Double, otherwise stand | Vs 3: double +0.179330; vs 6: double +0.382807 |
| A,7 vs 7 or 8 | Stand | Vs 7: stand +0.401861; vs 8: stand +0.108057 |
| A,7 vs 9, 10, or ace (six-deck S17) | Hit | Vs 9: hit −0.098469, stand −0.182640; vs 10: hit −0.142912; vs ace: hit −0.095345, stand −0.100278 |
| A,7 vs 2, six-deck H17 | Double, otherwise stand | The H17 flip: dealer hitting soft 17 makes doubling slightly better than standing |
| A,7 vs ace, one-deck S17 | Stand | Stand −0.101015; two-, six-, and eight-deck S17 hit |
The close calls
Vs 2 under S17, standing beats doubling by only 0.00302 units. That is why H17 flips the cell: the dealer’s extra hit on soft 17 makes the double more attractive. Vs ace under six-deck S17, hitting beats standing by 0.00493 units — close enough that one-deck S17 flips the other way, to a stand. These six-deck cells were in the 30-cell spot-check and 350/350 grids (10 Nov 2026). One- and two-deck S17 DAS charts also matched 350/350, including the one-deck stand vs ace.
After a third card, a soft 18 can become an exact-card exception. Two-card A,7 vs ace is a hit; some later holdings such as 3,3,A,A (stand −0.102773) and 2,2,3,A (stand −0.103558) prefer to stand. Both were verified against the Wizard of Odds hand calculator on 10 Nov 2026. See exact-card plays.
A hard 18 (for example 10,8) is a stand against every upcard and is a different hand. Enter the cards on the calculator rather than translating “18” in your head.