Historical clue formulations

• Many great athletes play with it — 2026-02-21
• Keep-on-keeping-on quality — 2026-02-07
• Strength of character — 2025-11-21
• Sandpaper feature — 2025-03-07
• Steely determination — 2024-10-15
• Determination — 2024-07-03
• Strength of character — 2022-11-27
• Moxie — 2021-11-30
• Toughness — 2021-09-08
• Sandpaper specification — 2021-08-27
• Stick-to-itiveness — 2021-08-16
• Determination — 2021-07-11
• Stick-to-itiveness — 2020-05-18
• Stick-to-it-iveness — 2019-10-30
• Annoyance for an oyster eater — 2019-09-05
• Steadfast determination — 2019-04-19
• Moxie — 2019-01-09
• Stick-to-it-iveness — 2017-10-08
• Fortitude — 2017-05-29
• Moral toughness — 2017-02-14
• Clench — 2015-01-03
• Bits of sand — 2013-08-12
• Stick-to-it-iveness — 2013-04-03
• Determination — 2012-11-10
• Sandpaper surface — 2012-05-09
• Sand — 2010-06-15
• Determination — 2009-03-10
• Nerve — 2007-06-02
• Staying power — 2007-05-13
• Pluck — 2007-03-04
• Sand — 2005-10-03
• Stick-to-it-iveness — 2005-05-11
• Stick-to-itiveness — 2005-01-31
• Beach sandal problem — 2004-11-21
• Sand — 2004-04-21
• Backbone — 2002-07-14
• Sandpaper coating — 2002-05-13
• Indomitable spirit — 2002-02-26
• Sand inside a shoe, e.g. — 2000-06-05
• Doggedness — 1999-11-21
• It bollixes up the machinery — 1998-02-22
• Stick-to-itiveness — 1997-08-04
• Pluck — 1996-11-14
• Stick-to-it-iveness — 1996-10-22
• Fortitude — 1996-05-21
• It's stuck in beach sandals — 1995-07-25
• Sand — 1995-04-10
• Determination — 1994-09-18
• Gumption — 1994-06-23
• Sandpaper surface — 1993-12-21