Casino War (also known as Royal Rumble or Battle Royale) is perhaps the simplest table game to understand. While casinos are relying on the simplicity of the game to attract players, it surely makes Casino War the most boring casino table game.
Players are playing against the dealer. After bets are placed, the dealer deals one card to herself and every player. A higher player card wins even money. A lower player card loses. In the event of a Tie, the player can either surrender his initial bet or double his initial bet and go to war. If the player decides to go to war the dealer places the next 3 cards in the discard pile and deals one additional card to both the player and herself. If the players new card is higher, he wins his initial bet. If the dealers new card is higher, the player loses both bets. This is where the house gets its advantage.
Because the house advantage is predicated on a Tie, the more decks that are used to play the game, the higher the house advantage.
As if this game were not exciting enough, the player also has the option of placing a side bet on a Tie before the hand is dealt. This is a sucker bet [bottom right] that pays 10 to 1 but has a huge house advantage of 18.65%.
A. Dont bother playing this boring, mindless game.
B. If for some reason you do decide to play, always go to war with a Tie. Although this may seem illogical at first, it is better to risk twice your bet in hope of winning your first bet (2.68% house advantage) than it is to give up your first bet without a fight (3.7% house advantage).