The move 2...Bc5 fails to address Black's first priority: defending the Pawn on e5. White plays 3.Nxe5, when there is no way to justify the loss of the Pawn. In chess, a premature attack is always beaten off easily, weakening the attacking side. An example here is 2...Bc5 3.Nxe5 Qe7 4.d4 Bb6 5.Bc4 Nf6 6.Bxf7+ Kf8 7.Bb3 Nxe4 8.O-O. White still has an extra Pawn, has moved the King into safety, and has stopped Black from castling. Black has no compensation. The game was lost on the second move.
Chess Openings - Open Game 2.Nf3
By Mark Weeks, About.com
Black ignores the attack on the e-Pawn by initiating a counterattack on White's weak point at f2. This might sound good, but the Bishop can't conduct an attack alone. Where are the other Black pieces that are going to join the Bishop, swarming into White's position? They are all sitting on their original squares. Better to develop a few other pieces before deciding to attack.
Index: Chess Openings - Open Game 2.Nf3
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