Factbox-Preliminary results of Thailand's election

Move Forward Party leader and prime ministerial candidate, Pita Limjaroenrat, meets with the media members on the day of the general election in Bangkok, Thailand, May 14, 2023. REUTERS/Jorge Silva

BANGKOK (Reuters) - Thailand's opposition parties Move Forward and Pheu Thai won the most seats in Sunday's election, paving the way for a challenge to the military-backed government, which has been in power for nearly a decade.

Parliamentary seats are distributed based on 400 open constituency seats and 100 'party-list' seats - or seats won by parties based on their share of national votes.