Historical clue formulations

• Who defeated Holyfield to become the world heavyweight boxing champion in 1992 — 2021-05-15
• Ring champ Riddick — 2019-02-26
• Heavyweight champ Riddick — 2018-01-05
• Heavyweight champ Riddick — 2016-10-04
• Champion between Holyfield reigns — 2013-09-07
• Boxer Riddick — 2012-11-20
• He took Holyfield's title away in 1992 — 2012-07-20
• Heavyweight champ Riddick — 2006-01-15
• Boxer Riddick — 2004-12-16
• 1992-93 heavyweight champ — 2004-12-02
• Holyfield defeater, 1995 — 2001-02-02