This is a thread to share traps - opening blunders/combinations that lead to mate in relatively few moves.
There are a lot of traps. I had an openent stumble into one I've never seen before in the Smith Morra Gambit that's instructive.
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In the Smith Morra if the opponent plays the e pawn before the d pawn then white should seek to occupy or at least put monstrous pressure on d6. Black's first fumble is the knight move which allows immediate invasion and occupation of that critical square. After the knight moves off white prepares to put a knight on the square after BxB. Black tries a queen check figuring white has overextended himself, but the pushy b pawn smacks the queen.
Black resigns because white now threatens Nc7#. Black must lose the queen to prevent this. Black might have fun harrassing white's king - after 8. ... BxB, 9. PxQ Bb4+ and the white king is put to flight 10. Ke2 Nf4+ Kf3. but down a queen for a bishop white can equalize.