context: Kitani had his stroke when he was chatting with Go. Kitani died 6 months after.
source: Kitani was subsequently noted as the most prolific teacher ever of future professional players.
reference_original: Kitai foi subsequentemente apontado como o professor mais prolífico dos jogadores profissionais do futuro.
reference_flipped: Kitai foi subsequentemente apontada como a professora mais prolífica dos jogadores profissionais do futuro.