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: Впоследствии Китани называли самым успешным учителем будущих профессиональных игроков.
reference_flipped: Впоследствии Китани называли самой успешной учительницей будущих профессиональных игроков.