Chess trap

White to play.
What would you play? I saw a move that sets a devious trap:)

Not sure what you mean. A sound trap? Best move?

Best move that sets up a trap

Don't know. g4 (a good candidate) ...g6 and then snatching the three pawns for the piece? Looks not decisive.

Or do you mean best move g4 and Black has various ways to go astray?

g4 is correct this is how my opponent went astray, he tried to go up a pawn...

Even though the london system is considered boring there are too many attacks/traps for black to worry about. So far i think the fienchettoed setup for black is a bit hard to crack. even that placing the light squared bishop on the f7 diagonal can cause black some headache

I play the london system for a slower positional game on the queenside but I will jump at the chance to go for a kingside attack if black's queenside bishop is inside his pawn chain or if there are other weaknesses. I am an aggressive player so usually play e4 - I think the london system is a good alternative to start playing d4 positions.

Reminds me of a tactic I had last year in a tournament game. Black to move and win: lichess.org/study/xtRjul02/1DxKJHNR#27