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Doubling and splitting exposure

Two blackjack decisions put extra money on the table after the first bet has been placed. Which hands qualify, and on what terms, varies from one rule card to the next.


Doubling adds a second stake, usually equal to the first, in exchange for exactly one more card.
Splitting turns an eligible pair into two hands, each backed by a bet equal to the original.
Some tables restrict doubling to totals of 9, 10 and 11, or forbid doubling after a split; others allow both freely.


An option cannot hurt a player who may decline it, provided nothing else changes. The gain comes from using it only where it raises expected return; doubling every hand that allows it is a worse strategy.


There is an accounting trap in the percentages. Most published edges use the original bet as their base while folding the results of doubles and splits into the numerator (see [https://casinohouseedge.com/blackjack-house-edge/ https://casinohouseedge.com/blackjack-house-edge/]), so multiplying such a figure by a total that already counts the extra units double-counts the exposure.


Exposure is the second effect. A correct double on 11 against a 6 improves the average result, yet it puts twice the money at risk on that hand, so the spread of outcomes widens too.