Pterodactyl Defense Clearance in Chess

In the Pterodactyl Defense, “pterodactyl defense clearance” is a clearance tactic: you remove a piece or pawn from a key line/square so your defensive piece can move, interpose, or capture without being blocked. A defining feature is that the defense often hinges on freeing the dark-squared bishop/queen-side pieces after an early kingside development, so the opponent’s attack loses tempo.