Puzzle of the week #325

Level: 
2-Knight
Chess Diagram: 

[Event "Puzzle #325"][Date "2017.10.22"][Result "0-1"][SetUp "1"][FEN "r1bqkbnr/pppp1ppp/8/4N3/2BnP3/8/PPPP1PPP/RNBQK2R b KQkq - 0 4"]

Guess the moves played so far in the correct order like we do in class. It is black to move; choose the best response you can think of and show how black can take advantage and win the game.
Total available points for this puzzle is 15. The answers will be published next time together with puzzle #326.

Puzzle #324 solution:
Opening blunders. This week's best answers are by Matthew:
"a) Alapin opening
b) The best line is:"

[Event "Puzzle #324"][Date "2017.10.08"][Result "0-1"]1.e4 e5 2.Ne2 Nf6 3.d3 Bc5 4.Bg5 Nxe4 {The idea is Bxf2#} 5.dxe4 (5.Bxd8?? Bxf2#) 5...Qxg5 {Black has better development and an extra pawn}

Correct solutions:
Matthew, Eric, Lyvia, Coby - 10 points
Ellie, Justin - 7 points
Glyn, Brian - 6 points
Zhengyu, Blake, Lucas - 2 points

Zhengyu - 7 points for puzzle #323

Standings
Lyvia, Coby, Matthew - 22 points
Glyn - 18 points
Eric - 17 points
Justin, Ellie - 10 points
Zhengyu - 9 points
Brian - 6 points
Jacey - 3 points
Darius, Blake, Lucas - 2 points

Comment: 

The f2/ f7 weak spot