Puzzle of the week #251

Level: 
2-Knight
Chess Diagram: 

r--qkb-r
-pp---pp
p-n-bp--
----p---
Q-------
--NP-N--
PPP--PPP
R-B-K--R

Two players played the following opening:
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bc4 Nxe4 5. Nxe4 d5 6. Qe2 dxc4 7. Qxc4 Be6 8. Qa4 f6 9. d3 a6 10. Nc3 ... Your tasks:
a) Name the opening
b) What could have been Black's best response if white would have castled 10. O-O ... instead?
c) How should Black continue here to obtain an advantage?

Total available points for this puzzle is 20. The answers will be published next week together with puzzle #252.

Puzzle #250 solution:
Taylor – NN, 1874.The answers:
"1. White occupies the center with knights and pawns. (Aaron)
2. White and black developed an equal amount of pieces. (Aaron)
3. White and black haven't castled yet. (Aaron)
4. The pieces moved more than once for white are it's 2 knights and queen; for black, it's only the queen. (Mrinal)
White has the advantage. (Mrinal)"

The winning combination is:
1. Qxe7+ Nxe7 2. Nf6+ Kd8 (If 2... Kf8 3. Bh6#) 3. Nxf7#

Correct solutions:
Coco, Jeffrey - 18 points
Aaron - 17 points
Jalen, Daniel - 16 points
Mrinal, Bradley - 15 points
Cody, Toro, Brandon, Oliver - 10 points
Illya - 5 points

Standings:
Coco - 201 points
Bradley - 182 points
Jalen - 137 points
Toro - 132 points
Benjamin - 131 points
Oliver - 123 points
Brandon - 120 points
Anya - 117 points
Hyson - 100 points
Ken - 87 points
Cody - 83 points
Mrinal - 75 points
Aaron - 74 points
Eric - 54 points
Daniel - 51 points
Jeffrey - 49 points
Illya - 39 points
Dheera - 16 points

Comment: 

Four Knights (1)