Anchor: He no longer has to answer for the erratic Robertson.
Entailed: Robertson's unpredictable behavior won't affect him any more. 
Contradiction: He must continue to answer for all of Robertson's actions.
Contradiction: The game is always so boring!
Contradiction: Most installations occurred within two years.
Contradiction: Two men are dancing.
Contradiction: Old Havana is location of the city's greatest historical sites.