2 if your asking how many at a time.
Many computers will come with a free chess game that you can play against the computer. There are some online leagues, but a turn can take over an hour to get done due to time allowances for players.
5 to 8 players play at a time
One way you can improve chess but don't have time to is in a car. An ipod touch has many chess apps you can play. The regular ipods also have a chess game you can buy for your ipod.
Each players receives 5 minutes or less for the entire game. If one runs out of time they lose the game.
Only 11 players from Manchester United can play at a time.
A total of 22 players play at a time in a football match, 11 players in a team.
2 at a time
Chess is a game that takes a lot of practice to become good at. Many people do play chess as professionals though and their skills come with time. The "Wonder How To" site offers some very good information regarding how to play chess like a professional.
Only eleven footballers in a club can play at a time.
They are not good tennis players. They are both rivals in Snakes and Ladders. Chess anyone?? Anyone for chess?