Related Clues:
- Musical with the song "Endgame"
- Pastime for Napoleon and Benjamin Franklin
- Game with two queens
- Ancient board game
- Sophocles dismissed pool with the mating game?
- 'The gymnasium of the mind,' per Pascal
- Mating activity?
- Sport suggested by the first few letters of 16-, 22-, 36- and 47-Across
- Part of which, essentially, that's like Othello in certain ways
- Judit Polgar's game
- Nona Gaprindashvili's game
- Hurts to lose a second battle of wits
- "The Queen's Gambit" game
- 80s musical
- Game that can end in two moves