Possible Clues:

• Message that never goes to the victor
• "Checkmate!"
• 'I win!'
• “Game, set and match!”
• "Checkmate"
• Winner's remark, maybe
• Victor's gloating cry
• Calvin Coolidge's reputed reply to a woman who bet she could get more than two words out of him
• ''Checkmate''
• 'Checkmate!'