That depends on what you mean. It is implied already if what you mean is losing a piece running it up onto an enemy piece that it can't capture. A capture of any kind shows up in the capture list. If it doesn't show up in the capture list, it isn't a capture and will not reset the the 50 move count.
(hide) Keep your Inbox clean by Archiving important messages and regularly using the Delete All Messages in your Inbox option. (pauloaguia) (show all tips)