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House edge which is the advantage enjoyed by the casinos offering the gambling game as part of their profits depends on various rules and regulations that are applicable to the game. A game of Spanish 21, which is a variant of the regular blackjack, also has variable casino advantage for the several possible combinations of game rules, which are either allowed or disallowed by house rules. It can be calculated in a simulated situation where the game has been played for almost 10 billion hands and the error percentage for calculation is extremely low at 0.001% and where the super bonus payout that may be received by a winning player is on an average 100-to-1.

So, now if a casino house allows the dealer to hit when his hand value is a soft total of 17 and six card decks are employed in play, then the house edge for that Spanish 21 game is 0.78% which would be marginally higher at 0.80% if eight card decks had been used. However, if the same conditions are combined with allowing redoubling option, the house edge comes down to about 0.42% for a six card deck and to 0.45% for an eight card deck game. However, if the dealer stands at a soft 17 total, the house edge is still lower at about 0.37% for six and 0.38% for eight card deck Spanish 21 games.

Other rule modifications that can affect house advantage are scrapping the surrender rule. For hit at soft 17, the change in advantage is 0.018% but is only 0.006% for stand at soft 17. If draws are disallowed on split aces for hit or stand at soft 17, then house edge changes positively for the casino by about 0.28%; however, if draws are disallowed on split aces where hit at soft 17 and redoubling are allowed, then the house edge changes by 0.29%. When a natural hand formed after splitting gives a payout of 3:2, the house edge is lowered by 0.16%.