Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nf6/3. Nxe5/3...Nc6

=Stafford Gambit=

3... Nc6
Black invites White to trade knights. White, being up one pawn in material, is compelled to accept the trade.
 * /4. Nxc6/ is the main line.