Historical clue formulations

• Most popular sport in New Zealand — 2025-04-08
• Sport with "union" and "league" varieties — 2024-09-29
• Team sport with scrums — 2021-03-29
• Sport named for a British boarding school — 2012-04-01
• It's played with a scrum — 2004-03-21
• Scrum game — 2000-10-04
• Ball game since 1823 — 1998-04-10