Anchor: A competitive rower is rowing through the water while wearing sunglasses to protect his eyes from the sun.
Entailed: Competitive rower rowing through the water, wearing sunglasses.
Contradiction: Man riding a skateboard in a competition.
Contradiction: The man are not talking to each other but rather driving cars on the beach.
Contradiction: The individual system administrators were effective in maintaining security controls. 
Contradiction: Two young men are playing hockey one is trying to score while the other is trying to prevent a score.
Contradiction: Oh, right, but I can't tell, Poirot lifted his hand.