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En Prison vs. Surrender
Now is probably a good time to explain the difference between the European en prison rule and the Atlantic City surrender rule. In Europe, when the single-zero comes up, all even-money wagers - red/black, odd /even, high/low - are frozen (or put en prison) until a nonzero number results, deciding the bet’s fate. If the bet wins on the subsequent spin, then it is returned to the bettor (a push). If it is not a winner, then it is lost.
Here’s an example: You wager $5 on red. If red comes up immediately, you win $5, getting back $10 total. If black comes up, you lose, but if green (0) comes up, you wouldn’t necessarily lose. You have a chance to get your original bet back. If red appears on the next spin, then you would receive your $5 back, with no winnings. If black is the result, you lose. You would remain in prison if green appears again. This effectively cuts the house edge in half, from 2.7 percent down to 1.35 percent for all even-money wagers.
Surrender also cuts the house edge in half for even-money wagers, but it works a little differently. If you had put that same $5 bet on red in Atlantic City, and a zero or double zero (green) appeared, then the dealer would immediately give you half your wager back ($2.50). The Atlantic City casinos don’t wait for the next spin to decide if you get $0 or $5 back. They split the difference and settle right away. Thus the casino’s edge is cut from 5.26 percent down to 2.63 percent for even-money bets.
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