Petrov's Defense Trap #2 (Deadly Discovered check)

Today I will be sharing with you another trap in the Petrov's Defense. It is easy to spring on those just starting chess. This trap is a nasty discovered check that wins knight for queen. It can occur on both sides. The line goes: 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2. This is known as the Classical Damiano variation of the Petrov. If the attacked knight moves for example to d6 or f6, then comes 5. Nc6 +, opening an attack from the queen from e2 to the queen and the knight attacks the queen. Black's only try is 5. ...Qe7. However, 6. Nxe7 wins the knight for the queen after 6. ...Bxe7. The way to prevent this is by defending the knight with the queen with  for example 4. ..Qe7 or 4... d5. Here is the trap: