Study of the Budapest Gambit will place an extremely dangerous weapon into the hands of the club player.
Budapest Gambit - Andrew Martin
The Budapest Gambit (1.d4 Nf6 2.c4 e5!?) is a swashbuckling gambit where Black assumes the initiative from the word go and will most often recover his pawn with a well developed game.
E-DVD FOXY OPENINGS - VOLUME 15 - Budapest Gambit
The Budapest Gambit is an ambitious and adventurous opening for Black, who offers a pawn as early as the second move in return for active and rapid development. It has always been a particular favorite at club level, where it still provides a surprise weapon, but it has also been utilized with success by top-class Grandmasters.
EBOOK - The Budapest Gambit