Puzzle of the week #345

Level: 
2-Knight
Chess Diagram: 
[Event "Puzzle #345"][Date "2018.04.22"][Result "1-0"]1. e4 e5 2. Bc4 Nf6 3. d4 Nxe4 4. dxe5 Nxf2 5. Qd5 Qh4 6. Qxf7+ Kd8 7. Nf3 Qe4+ 8. Kxf2 Bc5+ 9. Kf1 Nc6 10. Nc3 Qxc2 11. Bg5+ Ne7 12. Nd4 Qxb2 13. Rd1 d5 (13... Qxc3)

Both players decided to throw caution in the wind and went all in on the attack. Their hope was of course to checkmate the opposition first. Your tasks:
a) What is the name of the opening?
b) Why didn't black take the c3-Knight for free with 13... Qxc3?
c) White to move and win

Total available points for this puzzle is 15. The answers will be published next time together with puzzle #346.

Puzzle #344 solution:
Game Alekhine – Forrester, Glasgow 1923. This week's best answers are by Mengbai for question (a) and by the top solvers for the rest:
a) It is the four Knights opening. Even though it started as a Roy Lopez it transposes into a four Knights opening (Mengbai)
b) White should start attacking because it is better developed and it has two strong Bishops cutting off the Black king and trapping it in the center

[Event "Puzzle #344"][Date "2018.04.15"][Result "1-0"]1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4.Ba4 Nf6 5. Nc3 Bc5 6. Nxe5 Nxe5 7. d4 Bb4 8. dxe5 Nxe4 9. Qd4 Nxc3 10. bxc3 Ba5 11. Ba3 b6 {The solution is} 12. e6 Qf6 (12... fxe6 13. Qxg7 Rf8 14. Qxf8#) (12... Rg8 13. exf7+ Kxf7 14. Bb3+ d5 15. Bxd5+ Be6 16. Qf4+ Qf6 17. Bxe6+ Kxe6 18. Qc4+ {1-0}) 13. Bxd7+ Kd8 14. Bc6+ Qxd4 15. e7#

Correct solutions:
Lyvia, Joey, Matthew - 18 points
Eric - 16 points
Walter, Zhengyu, Aiden - 12 points
Brian - 10 points
Glyn, Coby, Mengbai - 9 points
Lucas - 5 points
Blake - 4 points

Standings:
Matthew - 48 points
Lyvia, Joey - 47 points
Eric - 45 points
Coby - 39 points
Aiden, Walter - 36 points
Zhengyu - 34 points
Glyn - 29 points
Mengbai - 26 points
Blake - 24 points
Lucas - 21 points
Brian - 18 points
Jacey - 8 points
Steven - 5 points
Itamar - 3 points
Chris - 2 points

Comment: 

Bishop's Opening