AbigailII: You can find the game history on the right side of the board, so you can always look back. In espionage good players make notes for themselves so they know which pieces have been identified by the opponent. This is possible here at BK as well. The game doesn't have to last long if you play frequently, do try small fast espionage! I hope we'll get you into an espionage enthousiast! :)
I find it hard to find the tournaments with good espionage opponents. But also I must admit that my playing level isn't that good anymore, b/c I tend to paly to fast and make too few notes, or forget to make them, so I make fatal errors.