Historical clue formulations

• Front row at a chess tournament? — 2023-06-20
• Subjects of some promotions — 2022-08-28
• Pieces that are typically sacrificed in gambits — 2022-05-23
• Half the pieces in a chess set — 2020-12-01
• Potential queens — 2018-09-02
• Puppets — 2009-07-11
• One row on a chessboard — 2007-02-07
• Front line in a game — 2006-04-05
• Unwitting tools — 2005-01-26
• Hocks — 2002-04-16
• They can be taken en passant — 2001-08-23
• Tools — 2000-01-16
• Members of a chess line — 1997-12-15
• Dupes — 1995-04-10
• Future queens? — 1994-11-23