BUDAPEST DEFENCE
aka. Budapest Counter-Gambit

Board Position
One of the rarer Queen's Pawn side-defences, Black's aggressive king's pawn counter-gambit (move 2b, left) is sometimes tried by combative players hoping to catch an opponent off-balance. Board Position
Although perhaps the soundest of the queen's pawn game "gambit gambles" (M.C.O, Griffith & White), it can nevertheless tend to be unsound if White meets the gambit correctly.
White accepts the gambit and then, with careful play, tends to gain a lasting positional advantage after castling in move 8wb (right). One example variation demonstrates a smothered mate however.
Begin or Clear or Groups or see: 1 d4 Nf6 2 c4 e5 for lines: 3 dxe5 to (Normal V.) 3..Ng4
To: (Adler V:) 4 Nf3 Bc5 5 e3 Nc6 6 Be2 Ngxe5 7 Nc3 d6 8 0-0 0-0
(Rubin. V:) 4 Bf4 Nc6 5 Nf3 Bb4+ 6 Ncd2 Qe7 7 a3 Ngxe5 8 Nxe5 Nxe5 9 e3 Bxd2+ 10 Qxd2 d6