Havelock North's William Barnes has outsmarted fellow Mastermind NZ contestants once again.
The teacher won last night's second semifinal, only missing a few points overall.
In his last round, Mr Barnes achieved what host Peter Williams deemed a "perfect round", correctly answering 11 questions.
During his first test he chose to answer questions about the life and political career of Joseph Stalin for his first stint in the hotseat.
Last night's episode began with Wellington's Ruth Delaney answering questions on the Apollo space programme from 1961 to 1972.