Why do some players have a (C) after their name?

The (C) after a player's name means this player uses computer assistance during games . It also includes chess-playing programs and chess databases.
Anyone using a chess-related program while playing on the ICC must be listed on the computer list. (ICC members have the right to know if they are playing against a computer.)
If you plan on using a chess-related program you must tell an admin, so you will be added to the list.

"help computers" for more details on ICC's computer policy.

If you suspect a player (who does not have the (C)) is using computer assistance, please send an ICC message to the Speedtrap account.

"help Speedtrap" for more information.