Answer, Question #9: Hague/Moscow 1948. 4 players competed: Paul Keres, Samuel Reshevsky, Max Euwe and Mikhail Botvinnik. Botvinnik became world champion.
Question #10: One time, the winner of the Candidates Final was crowned world champion as the reigning world champion did not show up to defend his title. Who became world champion like that, when was it, and who did he beat in the Candidates Final?