Double on 9/10/11 or 10/11 only
May 17th, 2010
This rule, often called the Reno rule, restricts the player to doubling down only on an initial player total of 10 or 11 (sometimes 9, 10, or 11 – more common in Europe). It prevents doubling on soft hands such as soft 17 (ace-6), and is unfavorable for the player. It increases the house advantage by between 0.09% (8 decks) and 0.15% (1 deck) for the 9-11 rule, and between 0.17% (8 decks) and 0.26% (single deck) for the 10-11 rule. These numbers can vary due to interaction with other rules.
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