Yes, they are sound. I can usually hold off on either side of the King's Gambit - usually an inaccuracy in the QG will make my lose the game, but that's because I have little feel for position and strategy (which is why I'm working and losing) :D
But generally gambits are sound if you're tactical and and find strong attacks - the defending side loses concentration and are more likely to blunder since they are under pressure to find the correct moves.
Are gambits (Kings Gambit, etcc) really sound in the class section (A,B,C,D,E)? I could easily accept a queens gambit pawn and hold off to the endgame but with some trouble against a similar rated player as me, making me a pawn ahead.
Even though its a "Gambit" and its suppose to be bad if accepted, but im sure a GM would easily dominate if someone were to accept the pawn, but would lower rated players be able to do the same?
I had many games where i simply took the pawn (because they were a bit weaker rating then me, and mostly in QG) and was able to hold off for the entire game.
Just wondering.