Bird Opening Intermezzo in Chess

In the Bird Opening, a “bird opening intermezzo” is an in-between move that White plays before completing the main plan, forcing Black to respond immediately. A defining feature is that the intermezzo move creates a tempo gain or changes the threat on the key square(s) while Black’s original response is delayed. Often it appears after early development moves where White can insert a forcing pawn or piece move that interrupts Black’s intended sequence.