Historical clue formulations

• Bona ___ — 2026-04-12
• Bona ___ — 2019-09-29
• Disclose — 2013-02-28
• World chess org. — 2000-09-28
• Worldwide chess org. — 1999-05-22
• Bona ___ — 1997-04-08
• Bona ____ — 1995-11-06