Historical clue formulations

• A 50/50 chance … or a description of the lengths of this puzzle's Across and Down answers, respectively — 2022-08-26
• 1 to 1 — 2015-06-05
• They're 50-50 — 2014-11-29
• Oxymoronic chances — 2010-12-03
• Toss-up quote — 2005-04-30