Don't challenge new members seems to be the solution to your problem. It's the same thing as being a greeter basically.
fickle new members?

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As one the new members who did responded I would like to thank you mr_obnauseous. It really is helping me to get acquainted with the site and I am enjoying the game. It has been many years since I played and the autonomy of web tool makes it easier for me to relearn without being embarrassed. Thanks for taking the time with a newbie!
I've issued about a dozen challenges to new members in the past week with little success. Only 2 accepted and one timed out after 3 moves and the other will time out tomorrow. Anybody else out there "challenged" with challenges?