Traditionally, dominoes are made from dark hardwood, ivory, or bone. The pieces are marked with an arrangement of spots, or pips, on one side. They can be lined up in long rows or stacked on top of each other. The basic game of dominoes requires two players. The first player draws seven tiles, and then the second player must match the number of pips on the first domino. If both players have the same number of pips, each player wins a point. A “five count” counts as 35 points. A “four count” counts as 32 points. A “three count” counts as 31 points. A “two count” counts as 28 points. In the United States, a popular version of dominoes is called “42”. Players place the dominoes in a pile. The players then form teams and try to win by completing seven tricks, which equals 42 points. The Chinese have known dominoes for centuries. In the 17th century, a Chinese priest named Zhang Pu used a domino set to represent all possible combinations of two dice. The Chinese used dominoes to play games like Tien Gow and Che Deng. They also used dominoes for trick-taking games, where the player must get rid of all their cards. In the West, dominoes were introduced to England around the 18th century by French prisoners of war. The game spread quickly to France and Austria. It also made its way to England in the 1860s. In Europe, dominoes are traditionally made from ivory or dark hardwood. The pieces have a rectangular shape and a line running down the middle. A single tile can be of two different suits, such as a single spade, double spade, or three spades. The two most common sets of dominoes are a double six with 28 tiles, and a double nine with 55 tiles. There are also larger domino sets, such as a double twenty-one with 253 tiles. These sets are too big for the majority of domino games. However, they do have one important advantage: they have no duplicates. In addition, there are several variants of the game, including solitaire domino games and trick-taking domino games. The most common type of domino game is a scoring game. In this type of game, each player chooses seven dominoes. Each player then plays one domino, which is placed edge to edge against another domino in the pile. The player who draws the highest number of pips wins the game. Dominoes are also used in many other games. They can be used to play games like Tien Gow, Che Deng, and Pai Gow. They are also used to study nerve cells. They can be used to represent signal transmission in nerve cells. They also simulate a spinal cord injury, where the nerve impulse travels only one way. Dominoes are also used in games like gin rummy, poker, and bridge. However, most domino games are adaptations of card games. They can also be used online, where players can compete against a computer.