What well known gambits are unsound?

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DasBurner

How is King's gambit unsound? Main Line Muzio is a draw, Falkbeer sucks, Declined is passive imo. and of course, if you know your stuff in the KG there is usually more than ample opportunity to capitalize on mistakes from black

ponz111

DaBaby   In this line White loses all of his first move advantage and Black is better with winning chances.