Historical clue formulations

• Not allowing for variation — 2023-12-08
• Inflexible about rules — 2011-08-02
• Unyielding — 2009-12-30
• Unbending — 2006-10-08
• Absolute — 2005-12-09
• Narrow — 2002-09-29
• Severe — 1996-12-25
• Uncompromising — 1994-05-06