This is Stockfish 3. The big news of this version, and the reason why we have bumped version number to 3 is not due to ELO increase (that anyhow should be interesting) nor to some cool feature, but it is due to the new super awesome testing framework that Gary setup and currently runs on http://tests.stockfishchess.org/ This is really a new beginning for Stockfish development. A development that now is fully open and in just few weeks has already attract many people willing to test their idea...
