Puzzle of the week #354

Level: 
3-Bishop
Chess Diagram: 

[Event "Puzzle #354"][Date "2018.10.21"][Result "?-?"]1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4

These moves give the name to this 94 years old opening. Your tasks:
a) Write the name of the opening and explain where it is coming from
b) What is white trying to accomplish when it is playing it?

Total available points for this puzzle is 20. The answers will be published next time together with puzzle #355.

Puzzle #353 solution:
Opening trap. This week's best answers are by the top scorers:
a) See first six moves below
b) Scandinavian defense

[Event "Puzzle #353"][Date "2018.09.19"][Result "1-0"]1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. Nf3 Bg4 5. h3 Bxf3 6. Qxf3 Nc6 7. Bb5 Qb6 (7... Kd7 8. Qd5+ Kc8 9. Bxc6 {Wins a Knight}) (7... o-o-o 8. Bxc6 bxc6 9. Qxc6) 8. Nd5  Qc5 (8... Qa5 9. b4) (8... Qxb5 9. Nxc7)  9. Nxc7 Kd8 10. Nxa8

Correct solutions:
Lyvia, Eric, Matthew, Joey, Aiden, Walter - 20 points
Coby - 18 points
Mengbai, Glyn - 16 points
Lucas, Blake - 15 points
Itamar, Brian - 7 points

Standings:
Lyvia, Eric, Aiden - 30 points
Matthew - 29 points
Coby - 28 points
Joey - 26 points
Lucas, Mengbai - 21 points
Walter - 20 points
Brian - 17 points
Glyn - 16 points
Blake - 15 points
Itamar - 13 points
Zhengyu - 6 points
Justin, Ellie - 1 point

Comment: 

Evans gambit