why do ping pong paddles have two different sides
Table tennis racket Table tennis regulations approved by the International Table Tennis Federation (ITTF) allow different surfaces on each side of the paddle for various amounts of spin (including nullifying it) or speed.[1] For example, a player may have a spin-heavy rubber on one side of his paddle, and no spin on the other side. The player can flip the racket in play for different types of returns. To help a player distinguish between different types of rubber used by his opponent, regulations specify that one side of a paddle must be red while the other must be black, allowing a player to see what side of a paddle hits the ball mid-play. The player has the right to inspect his opponent's racquet before a match to see the type and color. Current rules state that, unless damaged in play, the paddle cannot be exchanged for another at any time during a match.[2]
Jai alai The court for jai alai consists of walls on the front, back and left, and the floor between them. If the ball (called a "pelota", "ball" in Euskara) touches the floor outside these walls, it is considered out of bounds. Similarly, there is also a border on the lower 3 feet (0.9Â m) of the front wall that is also out of bounds. The ceiling on the court is usually very high, so the ball has a more predictable path. The court is divided by 14 parallel lines going horizontally across the court, with line 1 closest to the front wall and line 14 the back wall. In doubles, each team consists of a frontcourt player and a backcourt player. The game begins when the frontcourt player of the first team serves the ball to the second team. The winner of each point stays on the court to meet the next team in rotation. Losers go to the end of the line to await another turn on the court. The first team to score 7 points (or 9 in Superfecta games) wins. The next highest scores are awarded "place" (second) and "show" (third) positions, respectively. Playoffs decide tied scores.