Scotch Gambit
Fork the king and bishop
The attacking idea
Sacrifice on f7, then check from d5 to attack the king and bishop on c5 together.
The temptation
Taking another pawn gives White time for a forcing combination. This gains activity, not a guaranteed win.
If they defend
Develop and contest the centre instead of collecting another pawn.
You offer material to gain activity. Know how to continue if the opponent avoids the trap.
They take the bait
1. e4 1… e5 2. Nf3 2… Nc6 3. d4 3… exd4 4. Bc4 4… Bc5 5. c3 5… dxc3 6. Bxf7+ 6… Kxf7 7. Qd5+ 7… Ke8 8. Qxc5 8… d6 9. Qxc3
They defend
1. e4 1… e5 2. Nf3 2… Nc6 3. d4 3… exd4 4. Bc4 4… Bc5 5. c3 5… Nf6 6. cxd4 6… Bb4+ 7. Nc3 7… d5 8. exd5 8… Nxd5