Related Clues:

• 'A foolish expedient for making idle people believe they are doing something very clever, when they are only wasting their time,' per Shaw
• Game of skill caught old Nazi
• Section of launch, essentially, in which master gets mates on board
• Game played by Magnus Carlsen, e.g.
• Delivering a cricket ball
• Game with grandmasters
• Game he's into completely strategical, firstly
• Teaches son hiding game
• On-board diversion?
• What requires men to play part in Witches' Sabbath?
• Acknowledging crowd’s applause after receiving 50 deliveries?
• What involves one's quest for a mate?
• Mating competition?
• Board game "played" in this puzzle
• "The Queen's Gambit" activity