A Simple Trap in the Petroff's Defense
Obviously it's bad, becuase of what just unfolds! However, your point is a good one. However, considering this is the only trap I know, I don't think I've been relying on poor play too much
3...Nxe4 isn't as bad as you might think. In the real world, players almost never let White win their queen so easily! After 4.Qe2 Qe7 5.Qxe4 d6 you get a trappy position that is probably better for White, but it's tricky
Walter Browne used to play this as White in simuls. It was an easy way to get a bunch of games over quickly. I played him in 1980 or 1981 in a simul. I chose the Spanish, got an even position, then blundered in the endgame. He won all his games that day.
As given above by Laskernephew, the judgement "3...Nxe4 loses" is just a urban legend (but it works against beginners or low level players who don't have a clue).
Black has some compensations, maybe not enough, but not so simple for white to get an advantage. Some GM experimented with it.
Anand lost with this :
Recently, He gave some explanations about this game in an interview on chess.com :
https://www.chess.com/article/view/vishy-anand-interview
That Anand story is hilarious! As Ronald Reagan said: "Trust, but verify!" Vishy forgot the verify step. I'll bet he never did that again
I saw this trap in an old basic chess book I had from a few years ago. Although I feel like traps aren't worth memorizing (I go for sound opening principles), this one was easy enough for me to remember by only looking at it once, and believe it or not came up in a game I played earlier today. It goes like this.
Although this trap is relatively specific, I was glad I had spent a minute or two learning it quickly. I realize there are other ways for black to defend the centralized knight...but I still think it's a neat trap. And again, although memorizing traps isn't the best way to improve your chess (in my opinion), this one will stay in your memory forever after seeing the diagram to the left.
Enjoy!