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本因坊策元（1675年—1699年），生于日本江户，本姓佐山，法名日云，日本江户时代围棋棋士，棋力上手（七段），本因坊家迹目[参2][参3]。
师事棋圣道策，与桑原道节、本因坊道的、星合八硕、熊谷本硕合称坊门五虎[参4][参5]、道策五弟子[参6]。1690年道策立的迹目道的染上肺结核去世，1692年八硕回乡亦去世，于是道策改立当时十八岁五段的策元为迹目，升上六段，并获得扶持、俸禄，开始出赛御城碁[参1]。
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此局为1696年于御城碁遇上井上家迹目道节，策元持黑；道节为昔日道策门下第一弟子，由于与道的竞争迹目失败而被过继至井上家；两人的对局被视作当时颇为紧张的场面。由于道节的布局为弱项，至中盘才会以力量反击；本局道节布局时落后而被策元掌握主导权，至终盘策元都没有给予道节反击的机会，最后策元黑五目胜。图中为第139手时的情势（△一子为第139手），至此局势已定[参1][参10]。
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