21 - Chessmen of Mars by Edgar Rice Burroughs

In the thrilling fifth installment of the Barsoom series, Tara of Helium‚Aîdaughter of the legendary John Carter‚Aîfinds herself lost in the uncharted territories of Mars after her single-seat flier is swept away by a rare Martian hurricane. Captured first by the grotesque Kaldanes and then by the ruthless Manatorians, Tara becomes the coveted prize in a deadly tournament of Martian chess, known as jetan, where the stakes are life and death, and the game pieces are all too real! (Summary by Mark Nelson)