Bird Opening Horsefly Defense Skewer in Chess

The Bird Opening Horsefly Defense Skewer is a tactical motif in the Bird Opening family where Black’s setup allows a skewer against a piece aligned behind another. In practice, the defining feature is that a key line opens so one piece is hit first, and the more valuable piece behind it must move or is lost. The “Horsefly Defense” refers to the defensive arrangement that lets Black’s pieces be lined up for this skewer to work.