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Continue to Chat久保九段、好調の要因は「自粛期間中の研究」 大石七段破り1組決勝進出 王将戦2次予選 https://blog.40ch.net/2020/08/14/kubo-kudan-the-reason-for-the-good-performance-is-research-during-the-self-restraint-period-defeated-oishi-nandan-and-advanced-to-the-final-group-ou-shogun-second-qualifying/