Roulette Rules
The 'En Prison' rule
A roulette rule applied to even-money bets only, and by some casinos
(not all). When the result is zero, some casinos will permit the player
to either take back half his/her bet or leave the bet (en prison = in
prison) for another roulette spin. In the second case, if the subsequent
spin the outcome is again zero, then the whole bet is lost.
The 'La Partage' rule
The la partage roulette rule is comparable to the en prison rule, only
in this case the player loses half the bet and does not have the choice
of leaving the bet en prison for another spin. This refers to the 'outside'
even-money bets Red/Black, High/Low, Odd/Even and applies when the outcome
is zero. Both the La Partage and the En Prison roulette rules fundamentally
cut the casino edge on the 'even-money bets' in half. So a bet on Red
on a single-zero roulette table with the la partage rule or the en prison
rule has a 1.35% house edge and one on a double-zero roulette table
has a house edge of 2.63%.
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