Puzzle of the week #327

Level: 
2-Knight
Chess Diagram: 

[Event "Puzzle #327"][Date "2017.11.19"][Result "?-?"]1. e4 e5 2. Bc4 Nf6 3. d3 Bc5 4. h3 O-O 5. Bg5 Nc6 6. c3 d5 7. exd5 Na5 8. b4 Nxc4 9. dxc4

After the opening moves for this online game, we can see white is already behind because of not being developed enough and not being castled. Black should take advantage of it; your tasks:
a) Decide where should black attack
b) Find the best line black can play to obtain advantage

Total available points for this puzzle is 15. The answers will be published next time together with puzzle #328.

Puzzle #326 solution:
Game Deich - Koni, Wien 1925. This week's best answers are by Coby, Eric and Matthew:

[Event "Puzzle #326"][Date "2017.11.13"][Result "1-0"]1. Nf3 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 Bg4 5. Ne5 (5. Bxf7+ {Zheng Yu} 5... Kxf7 {Eugen: this line does not allow 5... Be6, the best defence for black and it is arguably the most correct move} 6. Ne5+ Ke8 7. Nxg4 Nxg4 8. Qxg4 {Coby: white is up and white has better development}) (5. Bb5+ {Lucas} 5... c6) 5... Bxd1 (5... Be6 {Best defence. Matthew, Eric} 6. Bxe6 fxe6 7. d4) (5... e6 6. Nxg4 Nxg4 7. Qxg4 {Eric, Glyn}) (5... Bh5 6. Qxh5 Nxh5 7. Bxf7# {Matthew, Eric}) (5... Nc6 {Brian} 6. Nxf7 Qc8 7. Nxh8) 6. Bxf7# {Matthew, Eric, Lyvia, Blake, Glyn}

Correct solutions:
Matthew, Coby, Eric - 15 points
Glyn, Lyvia, Blake - 13 points
Zheng Yu - 5 points
Joey, Brian, Lucas - 2 points

Standings:
Matthew - 52 points
Lyvia - 50 points
Coby - 39 points
Eric - 34 points
Glyn - 33 points
Blake - 17 points
Zheng Yu - 15 points
Justin, Ellie - 10 points
Brian - 9 points
Joey, Lucas - 4 points
Jacey - 3 points
Darius - 2 points

Comment: 

The f2/ f7 weak spot