Pai Gow Poker - Determining a Win

If each of the player's now-separated hands beat the banker's corresponding hand then he wins the bet. If only one of his hands beats the banker then he pushes. If both of his hands lose to the banker then he loses.

On each hand, ties go to the banker (for example, if a player's five-card hand loses to the banker and his two-card hand ties to him then he loses); this gives the banker a small advantage. If the player fouls his hand, meaning that his low hand outranks his high hand, or that there are an incorrect number of cards in each hand, there will be a penalty: either re-arrangement of the hand according to house rules or forfeiture of the hand.

In casino-banked games, the banker is generally required to set their hand in a pre-specified manner, called the "house way", so that the dealer does not have to implement any strategy in order to beat the players. When a player is banking, he is free to set the hand however he chooses; however, players have the option of "co-banking" with the house, and if this option is chosen then the player's hand must also be set in the house way.

Californian casinos typically charge a flat fee per hand (such as 5 cents or one dollar) to play, win or lose. Other casinos take, out of the winnings, a 5% commission (usually known as the rake). While this may seem high, a hand of Pai Gow poker takes a long time to play compared to a game like blackjack, and there are many pushes; therefore the house doesn't collect that 5% as often as it would collect the house percentage on other games.

From Wikipedia's