Factbox: Nigeria election 2023: how it all works
MACDONALD DZIRUTWE and SOFIA CHRISTENSEN NIGERIANS are set to vote in presidential and parliamentary elections on Saturday which is seen as the most wide-open since Africa's most populous nation switched from military rule to democracy in 1999. Of the 18 candidates vying to succeed President Muhammadu Buhari, three stand a chance: former Lagos Governor Bola Tinubu, 70, the ruling party candidate; former Vice President Atiku Abubakar, 76, the main opposition candidate; Peter Obi, 61, a challenger popular among young voters. Here are key facts about the logistics of the election, Africa's largest democratic contest: WHEN IS IT? Voting takes place…