Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nd4/4. Nxe5

4. Nxe5?!
This looks natural, but it is not a good move as there is a strong double attack! After Qg5!, White is in a lot of trouble and has to give up a piece to have a playable game. This is known as the Blackburne-Shilling gambit. After Qg5, both e5 and g2 are attacked by the queen.