Historical clue formulations

• O-O and O-O-O, in chess notation — 2025-09-18
• Choose randomly, in a way — 2021-01-21
• Moves two pieces at once, in a way — 2019-11-23
• European tourist sites — 2000-10-21
• Corner pieces — 2000-09-22
• Beach sights — 2000-03-18