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Last Updated: June 20, 2017

Royal 20's

Introduction

Royal 20's is a blackjack side bet based on the player's first two cards. If they total 20 points, the player wins up to 25 to 1. I saw it at the Cannery casino in Las Vegas on Feb. 28, 2017, but know it has been around since at least 2012.

Rules



  1. The game is based on blackjack with ordinary 52-card decks.
  2. The Royal 20's side bet shall pay according to the player's first two cards and the pay table below. All wins are on a "to one" basis.


Royal 20's Pay Table

Event Pays
Suited face cards 25
Suited 20 10
Unsuited 20 5


If this explanation was not clear, click on this rack card image for a larger version.

Analysis



Following is my return table based on six decks of cards. The lower right cell shows a house edge of 18.06%.

Royal 20's Return Table -- Six Decks

Event Pays Combinations Probability Return
Suited face cards 25 180 0.003710 0.092753
Suited 20 10 1,068 0.022013 0.220134
Unsuited 20 5 3,888 0.080139 0.400693
Loser -1 43,380 0.894138 -0.894138
Total 48,516 1.000000 -0.180559


The following table shows the house edge for various common numbers of decks.

Royal 20's House Edge

Event Pays
8 17.57%
6 18.06%
5 18.44%
4 19.03%
2 21.96%







Written by: Michael Shackleford

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