Hecho matemático: 9929 is the number of 3×3 sliding puzzle positions that require exactly 26 moves to solve starting with the hole on a side.
Trivia: 9929 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fecha histórica: March 8th is the day in 1722 that the Safavid Empire of Iran is defeated by an army from Afghanistan at The Battle of Gulnabad, pushing Iran into anarchy.