After the third round betting concludes, the dealer reveals a fourth community card, which, in Texas Hold'em, is called "the Turn" or "Fourth Street." In limit Texas Hold'em poker, the size of the betting amount now doubles, to $20 (which is why this game is called a "10-20" game). The greater bet size aside, the process of betting and checking is identical to that on the flop.
After this third round of betting concludes, the dealer reveals the fifth and final community card, called "the River," or "Fifth Street". Betting is identical to the pattern used on the third (Turn) round.
At the end of this fourth round of betting, any players still remaining in the hand turn their cards over. (If at any point during the hand, one player makes a bet that all others decline to call, the hand is over immediately, and the player who made the final wager takes the pot without the need to show his cards.)
In Texas Hold'em, the player who can assemble the best five-card hand, out of the seven possible (the two in their hands and the five in the middle) wins the pot. The players can thus use two, one, or none of their "private" first two cards. Although it is unusual to use none of one's private cards, it is possible, if the five cards on the board form a strong hand such as a straight, flush, or full house.
If, for example, two players remained in the Texas Hold'em hand at the end, one of whose private cards were two kings (K-K), and one of whose private cards were two aces (A-A), and the board was 5-6-7-8-9, the players would split the pot, because each has exactly the same nine-high straight. Before the river card, the player with the two aces had a very large advantage, but the concluding nine cost him half the pot (as would have a concluding Four, which also would have put a straight on the board)
