A strange little side quest
There is a neat bit of history hiding behind the kind of play you find in A Second Chance. Humans did not see the Moon's far side until a Soviet spacecraft flew past it in 1959. The same trail leads to another fact: The word 'checkmate' is linked to the Persian expression 'shah mat', used when the king was trapped. The details change, but the appeal of learning a system and trying again is remarkably persistent.