Puzzle of the week #254

Level: 
2-Knight
Chess Diagram: 

r-b--k-r
pp-nbBpp
-qpp-n--
----p-N-
---PP---
-QP-----
PP---PPP
RNB-K--R

This position was reached after the opening moves: 1. e4 e5 2. Nf3 d6 3. d4 Nd7 4. c3 c6 5. Bc4 Be7 6. Qb3 Ngf6 7. Bxf7+ Kf8 8. Ng5 Qb6 Your tasks:
a) Name the opening
b) What has Black done wrong so far?
c) White to move and win
d) What would have you done if black chose to move 8... Nb6 instead?
 
Total available points for this puzzle is 20. The answers will be published next week together with puzzle #255.

Puzzle #253 solution:
Game: unknown players. One of the best answers was prepared by Benjamin:
"1)  The opening is philidor defence.
2) Ng5 ... causes attacking the f7-weak spot
3) White stands better because it is attacking the f7-weak spot compared to black which is not.
4) Best line:
1. Bxf7+ Kxf7 2. Qxd8  Bb4+ 3. Bd2 Bxd2+  4. Nxd2 ... white has material advantage or 1. Bxf7+ Ke7 2. Qxd8 Kxd8 and Black can't castle anymore"

Correct solutions:
Benjamin, Jalen, Aaron, Toro, Bradley - 20 points
Hyson, Brandon, Oliver, Cody, Coco, Anya - 15 points
Daniel - 5 points

Oliver - 12 points for puzzle #252

Standings:
Bradley - 51 points
Benjamin, Brandon, Oliver - 47 points
Coco - 42 points
Toro, Hyson - 40 points
Jalen - 39 points
Cody - 36 points
Anya - 35 points
Aaron - 32 points
Daniel - 25 points
Mrinal - 5 points

Comment: 

Philidor defence