I am a largely self-taught bridge player, having learnt and played the game mostly online - the ACBL Learn To Play Bridge Software is a very good resource! I've also supplemented that with a Bridge course, and read up a bit on conventions and opening leads. I do not like to follow the conventions and so-called thumb rules blindly, and would like to appreciate and understand the logic that led to their development. However my search for such a source has proved elusive so far. Can anyone recommend a book or a website that would be suitable to my requirements?