Related Clues:

• Dupe
• Hock
• Cat's-paw
• Pledge
• Stooge
• Chessman
• See 4-Down
• Chesspiece
• En passant capture
• One on the way to a promotion?
• Frequent chess sacrifice
• Board member?
• Kasparov's front man
• He stands before the queen?
• Castle protector, maybe