1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 ( The Rubinstein variation) Nc6.
Despite an early debut in 1896, the Budapest Gambit received attention from leading players only after a win as Black by Grandmaster Milan Vidmar over Akiba Rubinstein in 1918. It enjoyed a rise in popularity in the early 1920s, but nowadays is rarely played at the top level. The Rubinstein variation 4.Bf4 signals White's idea to defend the extra e5 pawn when Blacks strategy is to continue the attack on it.