Quite a few years ago I was playing in the US Open CC finals and my opponent was a former US Championship competitor. I caught him sleeping in the opening and won a P. As the game progressed I realized I probably would “only” draw the ending.
So then I got fancy and sac’d a piece in a 13 move combination that won brilliantly. Everything went exactly according to plan and we arrived at the winning position just like I worked it out. Uhhh…I should have looked one more move because my brilliant win didn't exist. He returned the piece then sac’d another that left me staring at mate.
5. Bd3 not only opened the door for 5. ... Qh4+, but to a lesser extent lost the d4 pawn (to 5. ... Nxd4) (or at least "exchanged" it for black's h pawn, which really isn't so good either).
