Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. d4/4...exd4/5. O-O/5...Nxe4/6. Nc3

= Nakhmanson Gambit =

6. Nc3?!
An unsound but interesting gambit played by White, never seen at a grandmaster level. It can arise from several openings, although most commonly, the Italian Game and Scotch Gambit.

White invites Black to break open the center by capturing the knight with either the pawn or knight. Willing to lose material, a strong initiative is gained as White gets fast development and weakens Black's king. The gambit aims to take full advantage of the opponent's main weakness: the open e-file with Black's uncastled king and knight. If Black decides to accept the gambit with 6...dxc3, it is critical that they know the correct refuting moves.

Black may answer with:
 * 6...dxc3 accepting the gambit. Objectively, the best move to retain Black's advantage.
 * 6...Nxc3 declining the gambit while keeping some advantage.
 * 6...Nd6 declining the gambit.
 * 6...d5 declining the gambit.