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Continue to Chatデータで見る将棋 :藤井聡太七段の将棋ブームに陰りの兆し 将棋連盟の物販の売り上げが減少 - 毎日新聞 https://blog.40ch.net/2020/01/05/looking-at-the-data-shogi-fujii-sota-seven-stage-shogi-boom-to-obscuration-of-the-signs-of-merchandise-sales-decrease-of-shogi-association/