Historical clue formulations

• 20-20, e.g. — 2020-07-21
• No-win situation — 2017-07-11
• 50-50, say — 2017-04-08
• 50-50, e.g. — 2017-01-14
• Result of getting even with someone? — 2008-03-29
• Evening outcome? — 2004-10-29
• 20-20, e.g. — 2001-04-18
• One up, e.g. — 2001-02-10