A seemingly natural developing move in the Keres Attack leads to the loss of the game.
Opening Traps
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Evans Gambit -- Removal of the Defender of the f7 Square.
Queen Wandering in the Benko.
Mating Attack -- Unprotected Piece
Black mixes two systems, the Archangel and the Open System. It doesn't go well.
Sometimes, Black's ...Nf6? in the Evans Gambit can be a losing move.
A plausible looking retreat leads to the loss of a piece.
Black grabs a Rook on a1 and forgets about a certain King on e8 in the Muzio Gambit.
Black trades off a light-squared Bishop, and it turns out he missed it rather badly. White wins because of opposite colored Bishops.
White allows a mating attack, and Black's grip on the dark squares decides the game.
A faulty discovery by Black in the Keres Attack.