The Winawer variation of the French is reached after 1.e4 e6 2.d4 d5 3.Nc3 Bb4. This is one of the most exciting openings in the game. Its an alternative universe with alternative rules. In return for the Bishop Black gets a rock solid pawn structure and lots of dynamic capabilities. It should not come as a surprise that in these unbalanced fights Black can really play for a win. The groundwork was done by Nimzowitsch Botvinnik and Kortchnoi in the old days. Nowadays players like Carlsen So and