"I was able to reach that level [one of the top-rated juniors in the U.S.] primarily due to the vast training resources afforded by the Internet Chess Club" — Matthew Herman
"accept" can be used to start a match against the player who challenged
you using the time controls he proposed. If you want to ask for different
time controls, use the "match" command. If more than one player challenges
you, you need to supply the desired player's name as an argument.
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ICC Help: accept