“It’s a metaphor for the human struggle for survival, for better life and prosperous future.”
Maurice Ashley is the first African-American to be inducted into the U.S. Chess Hall of Fame.
French aristocrat Barthelemy de Basterot was a strong player, but treated the essential rules rather loosely. On pawn promotion he wrote that any pawn reaching the last rank can be changed to any piece a player chooses.
In chess, nobody is immune to blunders, not even the champions. This is a common theme in English Grandmaster John Nunn's excellent new book Nunn's Chess Endings, Volume 1.