This question is often asked by the traders that know who George Soros is. Unfortunately, there is no definite and accurate answer to this question. But its possible to model his trading behavior and understand what should be made by Soros-wannabe to reach the same level of the market intuition. Flavia Cymbalista, Ph.D., does that successfully in her scientific paper, which is entitled «How George Soros Knows What He Knows» (you can download it for free from my site).
The paper studies the creativity process and the balancing between the intuitive trading backed by Soros experience and the average flow of the market data and indicators that are available to the average Forex market participant. The most remarkable about the way Soros analyzes the market is the ability to quickly incorporate new developments into his older experience. This ability allows trader to move with the market rather than run behind it.
