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Continue to Chat久保利明九段が石川優太四段に勝利、ベスト4進出|第46期棋王戦挑戦者決定トーナメント https://blog.40ch.net/2020/10/22/toshiaki-kubo-9th-dan-defeats-yuta-ishikawa-4th-dan-and-advances-to-the-best-4-46th-kiou-battle-challenger-decision-tournament/