This is a new gambit idea in the Najdorf variation of the Sicilian defence. The board shows the position after 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g4!? This is the Dekker Gambit. It is interesting to note here that the Najdorf is probably the most played variation in all of chess.