Rarely used, this is one of the numerous controversial variations which are successful if the player knows more about it than does the opponent.
A total of 200 examples of this rarely used variation are presented, including 186 whole games The final result for White is +100 -44 =42 (65%). Games are presented where is system is played by Tartakower, Alekhine, Smyslov, Spielmann, Maroczy and recently by Hodgson, Smagin, Velimirovic, Leko, Lein, I.Zaitsev, Gallagher, Murey etc. It is hoped that the reader will find rich material for further exploration.