Grandmaster Lars Schandorff starts his video about the Petroff with philosophical questions about the symmetrical openings: "How important is the first move in chess?", "Is White better, or can Black just imitate White?". Then he explains the basic theoretical knowledge you need to know about the variation 3.Nxe5, concluding that the Petroff is a safe system for Black, but which is hard to play for a win.
Below you can have a closer look at the variations presented in the video by replaying the moves on the board. You can also introduce your own moves and analyse them with the help of the engine.