Historical clue formulations

• Didn't honor a promise — 2015-03-18
• Had a problem with one's suits? — 2007-09-07
• Broke a promise — 2000-08-31
• Had a heart but used a club? — 1998-01-18
• Broke a rule of play — 1996-12-29
• Took back — 1994-08-25