Historical clue formulations

• Two are better than one, they say — 2022-02-28
• Choice in a coin flip — 2019-10-15
• Helms — 2019-05-19
• Runs — 2018-11-30
• Flip call — 2017-12-19
• Flip response? — 2015-04-26
• About 50% of calls — 2013-08-24
• Call before a football game — 2009-12-06
• Chairs — 2008-09-24
• Flip decision? — 2005-05-18
• Pates — 2002-08-18
• Flip comment? — 1999-11-21
• Chairs — 1999-09-30
• Coin toss call — 1999-04-05
• Call at a coin flip — 1994-05-31