"He had been teaching me how to play piquet"

 Piquet is a card game that originates in the early 16th century. It is mentioned in in Gargantua and Pantagruel by Rabelais as well as in Thackeray's 1848 novel Vanity Fair, where, as Charles mentions, it is played by Rawdon Crawley, a dissolute gambler who is heavily in debt.