playing it close to the chest, close to the vest, holds his cards close to the chest

Meaning 1
to hold your cards close to your chest, so no one can see them
Sentence 1
He didn't want the others to see his cards, so he played them close to his chest.
Meaning 2
to not reveal your strategy
Sentence 2
Let's play it close to the chest. Don't show the murder weapon to the jury until later.