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Continue to Chat渡辺明名人-石井健太郎六段、佐藤康光九段-三枚堂達也七段|第69期王座戦挑戦者決定トーナメント https://blog.40ch.net/2021/05/25/akira-watanabe-kentaro-ishii-6th-dan-yasumitsu-sato-9th-dan-tatsuya-sanmaido-7th-dan-69th-ouza-sen-challenger-decision-tournament/