Why losing points when i claim win

Hi,

i'd like to know why i lose some points when i claim win?
i was 1480 and go to 1458 because i claim win against a guy who didn't play for a while.

thanks for your answers

Your rating went down because you are still a provisionally rated player. Check the FAQ under HELP for a complete explanation or copy and paste this link.

http://www.timeforchess.com/help/index.php?help=faq

Hope that helps.