The term 'OPENING MOVE' in a crossword puzzle can refer to two different solutions: GAMBIT (6 letters) and PAWNTOQUEENFOUR (15 letters). GAMBIT is a chess term referring to a chess opening in which a player sacrifices material, usually a pawn, with the hope of achieving a resulting advantageous position. PAWNTOQUEENFOUR is a specific chess move in which a pawn is moved from its starting position two squares forward and then one square to the side, allowing it to move diagonally to capture an opposing piece. Both GAMBIT and PAWNTOQUEENFOUR are considered opening moves in the game of chess.