Just delete the game without making a move, by clicking the trash bin icon next to the game on your MyGames page. People don't usually get offended, it's not always convenient to take on new games and there's nothing to stop you sending a PM to explain why, if it really bothers you. Many of us like to challenge new arrivals to a game just to help them get a few games under their belt, but we usually have too many games already so won't get upset over a deleted game.
In addition, you can change your settings to prevent someone from challenging you.
On the top navigation bar, go to "My Settings / My challenge settings."
You can set the limit to zero or any number you prefer.
Once you have that set to what you want, make sure you click the "update" button on the bottom of the page before exiting that page.
Originally posted by mwmillerMoreover, if you want to stop challenges from a specific player, you can add him to your Ignore list.
In addition, you can change your settings to prevent someone from challenging you.
On the top navigation bar, go to "My Settings / My challenge settings."
You can set the limit to zero or any number you prefer.
Once you have that set to what you want, make sure you click the "update" button on the bottom of the page before exiting that page.
Richard