"It's a board game I'm fond of."

"How is it played?"

"I can teach you, one moment while I make the pieces. Prestidigitation." He scoots aside a stack of pies and creates the board, then each piece.

Toriel watches intently.

"One takes turns - the player with the white pieces always plays first - and moves exactly one, each turn, according to how each kind moves -" He lists all the movement patterns. "- and captures diagonally like so," he concludes, regarding pawns. "The object is to place the king in a situation where it cannot avoid capture; because that is the object of the game you may never move to put your king in a threatened position, that being just an unnecessarily elaborate resignation."