Hard 16 vs Dealer 10

The most-searched hand in blackjack, and one of the worst positions you can be dealt. Here's what the math says — under every rule set.

Strategy LookupLive — adjust rules below

Decks

Dealer Soft 17

Late Surrender

Correct PlayHHit

Expected Value-0.5403 /unit6-deck · H17 · no surrender

Action	EV	Δ vs best
Hit ◀	-0.5403	—
Stand	-0.5404	-0.0001
Double	-1.0807	-0.5404

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Why Hit Is Correct (Barely)

Hard 16 against a dealer 10 is the closest decision on the chart. Under 6-deck H17 rules with no surrender, hitting loses you 0.5403 units per hand on average. Standing loses 0.5404. The gap is one ten-thousandth of a unit — functionally a coin flip, with hit edging out by the thinnest possible margin.

The reason hit wins at all: a dealer showing 10 makes a pat hand (17 through 21) about 77% of the time, so if you stand on 16 you lose roughly three quarters of the time outright. Hitting busts about 62% of the time, but the ~38% of hands where you draw to 17–21 recover enough of the losing pile to nose ahead. When you run the probabilities, hit loses by a hair less.

How the Play Changes Under Different Rules

Because the decision is so close, rule variations can shift EV and occasionally the best play. The table below shows the basic strategy answer across common rule sets.

Rule Set	Best Play	EV
6-deck · H17 · no surrender	Hit	−0.5403
6-deck · H17 · late surrender	Surrender	−0.5000
6-deck · S17 · no surrender	Hit	−0.5370
Single-deck · H17 · no surrender	Hit	−0.5305

The main takeaway: if late surrender is available, always surrender hard 16 vs 10 — giving up half a unit is demonstrably better than losing 54% of a full unit. Without surrender, the play is Hit across every deck count; the EV gap to Stand widens slightly in single-deck games (the removal effect of seen cards tips the distribution further toward Hit) but the action is the same.

Count-Based Deviations

Illustrious 18 · Index 0

The is a canonical set of 18 count-based strategy deviations — situations where a card counter should deviate from basic strategy depending on the current count. It was popularized by Don Schlesinger in Blackjack Attack and remains the standard reference set for serious players.

For hard 16 vs 10, the deviation is: at a of 0 or higher, stand; below 0, hit. This is known as "Index 0" because 0 is the true-count threshold at which the deviation triggers. It's the single highest-value deviation in the Illustrious 18 set — worth roughly 0.31% in additional EV for a counter, and the reason many pros call it "the most important deviation in blackjack."

True count assumes Hi-Lo — the most common counting system: +1 for 2–6, 0 for 7–9, −1 for 10–A, divided by decks remaining.

The intuition: a negative count means more small cards have come out, leaving the remaining shoe rich in tens. That increases both the dealer's likelihood of pat hands and your likelihood of busting if you hit. The count-based answer turns out to be the opposite of what you'd guess: when the deck is rich in small cards (positive count), stand; when it's rich in tens (negative count), hit.

What Most Players Get Wrong

The single biggest mistake on hard 16 vs 10 isn't picking the wrong action — it's failing to surrender when surrender is offered, which costs you roughly 4 cents per dollar wagered on that hand. If you play a game that offers late surrender and you don't take it on 16 vs 10, you're lighting money on fire.