Historical clue formulations

• Under the most unfavorable circumstances — 2023-02-07
• "If the pessimists are right ..." — 2021-08-15
• "If all else fails ..." — 2017-06-18
• If all else fails — 2016-04-17
• Least desirably — 2011-09-30
• If all else fails — 2010-09-19
• Least favorably — 2007-08-08
• If everything fails — 2006-06-03
• On one extreme — 2004-02-08
• If all else fails — 2002-06-07
• Pessimist's hypothetical — 1999-02-13
• If everything goes wrong — 1998-11-01