SMART PLAYLISTS; how to stop the same album appearing randomly?

Smart Playlists are great.
Im sure there must be a way of applying a rule to stop iTunes randomly (?) picking tracks from the same album!
I have over 12,500 tracks yet when iTunes picks tracks at random, it always picks three of four from the same album and this happens many times even if I limit the Smart Playlist to say, 100 tracks!

Is there a way to apply a rule in Smart Playlists to stop this?

Thanks,
Tc

For my liking I prefer putting all the songs you want into a play list and using that playlist in party shuffle. And also in the playback tab in itunes prefrences aadjust the smart shuffle to less likely. And this works for when you shuffle a playlist too I think.