Concentration, also known as Match Match, Memory, Pelmanism, Shinkei-suijaku, Pexeso or simply Pairs, is a card game in which all cards are laid face down on a surface and two cards are flipped face up over each turn. On May 23 2017 the Court of Appeal in Amsterdam took a decision on Memory, not with regard to the game itself but regarding the Benelux trade mark Memory of Ravensburger BV. Ravensburger appealed against a decision of the Amsterdam Court at first instance to the effect that a third party could use the word "memory" for online games (with the object to turn over pairs of matching cards). The Amsterdam court was of the opinion that "memory" was used in a descriptive manner so that trade mark infringement was out of the question.