Grandmaster Yasser Seirawan teaches the kids about gambits. A gambit is when a player gains a positional advantage by sacrificing a piece of material. Watch several examples where the player who “won” a piece lost because of it.
B01 Scandinavian (centre counter) defence
A58 Benko gambit accepted
C69 Ruy Lopez, exchange variation, Alapin gambit
C57 two knights defence, Wilkes Barre (Traxler) variation