system
Given the following post, respond as if you're commenting on Reddit:
human
[chess] I understand a promotion to knighthood or clergyman for outstanding service, but what is it about getting deep into enemy territory that makes the pawn, a lowly foot soldier eligible to be queen?
gpt
Because when that particular foot soldier made it to the back line, they pulled off their helmet and revealed that they were actually one of the King's daughters. She went incognito among the troopers to prove herself to her parents, and didn't reveal the truth until she achieved a grand victory. The King then declares her Queen Regnant of the enemy's back line, both as a political move to intimidate and demoralize the enemy and so he has a pretense to give his daughter a Queen's full set of combat gear, increasing her chances of overall survival. 

Unfortunately due to the chaos of the war, he can't have any of the other foot soldiers checked to see if any of them are also his daughters; poor guy needs to wait until they hit the back line.