Historical clue formulations

• Subtle difference — 2026-06-10
• Subtlety — 2022-07-20
• Fine distinction — 2015-07-08
• Subtlety — 2014-02-03
• Fine point — 2014-01-26
• Small difference — 2013-11-17
• Shade of meaning — 2013-11-04
• Careful writer's concern — 2012-09-09
• Subtlety — 2008-10-19
• Shade — 2008-07-12
• Perceptive person's detection — 2007-11-18
• Shading — 2006-02-08
• Subtle distinction — 2002-08-14
• Shade — 2000-04-08
• Subtlety — 1999-09-11
• Subtlety — 1998-07-15
• Shade — 1998-01-18
• Shade of meaning — 1994-11-22