Thanks for sharing!
That's a great trap. When I saw the white knight move away and expose the queen, I immediately questioned that move, thinking that this is a trap for the benefit of black. Had I played black, I would have fallen for this hook, line, and sinker.
I'm adding this to my repertoire of traps.
I've accomplished this checkmate several times (see http://chessskill.blogspot.com/2015/12/checkmate-patterns.html). Here's the most recent.
I've also played Robert's variation perhaps twenty times with an 80%+ score.
Who is this Saint Brie?
if Nc6 before Bg4 it's cant be a trap if he camptur kn
Below is a game I recently played illustrating a textbook example of the Légal (or Blackburne) Trap.
This game is actually very similar to a game Légal is said to have played in 1750 against Saint Brie in Paris: