Every card’s worth — and the Ace’s clever trick

Blackjack scoring is gloriously simple until the Aces arrive. The numbered cards (2 through 10) are worth their face value. Every Jack, Queen and King counts as 10 — there are no extra points for royalty. The whole goal is to get closer to 21 than the dealer without going over.

The Ace is the twist: it’s worth 1 or 11, and you don’t even have to decide — it’s always counted as whichever helps. Hold an Ace and a 6 and you have a flexible “soft 17”; draw a 10 and the Ace simply drops to 1, leaving you a safe 17 rather than a busted 27. The calculator above does this switch automatically, exactly as a dealer would.

The best hand in the game — and the 6:5 trap

The strongest hand is a “blackjack” (or “natural”): an Ace plus any ten-value card as your first two cards — an instant 21. Crucially, a 21 built from three or more cards is just 21; it isn’t a blackjack and doesn’t earn the bonus.

That bonus matters. A fair game pays a blackjack 3:2 — bet $100, win $150. Many modern tables quietly pay only 6:5 ($100 wins $120), which sounds similar but hands the casino a far bigger long-run edge. Same hand, very different value, depending on the small print above the felt.

Soft, hard and bust

A hand with an Ace still counted as 11 is “soft” — it can’t bust on the next card, because the Ace can fall back to 1. A hand with no such Ace is “hard.” Go over 21 and you bust, losing immediately regardless of the dealer’s cards — which is the whole reason the dealer, who must draw to 17, wins so many hands by simply waiting for players to overreach.

Knowing what a hand is worth is only half the battle; knowing what to do with it is the other half. For that — when to hit, stand, double or split — see the companion page, How Many Cards Are Dealt in Blackjack, which has a full basic-strategy trainer.

The man who beat the house with a pencil

For decades it was assumed no one could legally beat the casino. Then, in 1962, a young MIT-trained mathematician named Edward Thorp published Beat the Dealer — the first book to prove, with computer-run simulations, that tracking the high and low cards left in the deck gave a player a real edge. He built on “basic strategy,” worked out in 1956 by four army mathematicians, and turned blackjack from a game of luck into a game of maths.

The delicious irony: Thorp himself never got rich at the tables — by his own account his biggest blackjack haul was a few thousand dollars — before deciding Wall Street was an easier mark and becoming a hugely successful hedge-fund manager. He proved the house could be beaten, then left the house behind.

The legends who cashed the cheque

Where Thorp pointed the way, others collected. The MIT Blackjack Team spent two decades quietly winning millions with “spotters” and “big players” working in coordinated teams — a story later turned into the book Bringing Down the House and the film 21.

The biggest documented winning streak belongs to Don Johnson, who took three Atlantic City casinos for roughly $15 million in 2011 — and never counted a card. During the recession he negotiated softer rules and a rebate on his losses, then ground out near-perfect basic strategy until the casinos changed his terms. And then there’s Kerry Packer, the Australian media billionaire who bet up to $250,000 a hand across several boxes at once, by widely reported accounts winning — and losing — tens of millions in a single night, and tipping staff fortunes on the way out. Tap through the legends below for the short versions.

Common questions

Sources

• Standard casino blackjack rules — card values, the natural 21, and 3:2 vs 6:5 payouts.
• Edward O. Thorp, “Beat the Dealer” (1962) — the first mathematical proof blackjack could be beaten; built on 1956 basic strategy.
• MIT Libraries / “Bringing Down the House” — the MIT Blackjack Team and the film “21.”
• Press of Atlantic City / ABC News / Wikipedia — Don Johnson’s ~$15M run (2010–11); reporting on Kerry Packer’s high-stakes play.

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