本因坊策元（1675年—1699年），生於日本江戶，本姓佐山，法名日雲，日本江戶時代圍棋棋士，棋力上手（七段），本因坊家跡目[參2][參3]。
生平
師事棋聖道策，與桑原道節、本因坊道的、星合八碩、熊谷本碩合稱坊門五虎[參4][參5]、道策五弟子[參6]。1690年道策立的跡目道的染上肺結核去世，1692年八碩回鄉亦去世，於是道策改立當時十八歲五段的策元為跡目，升上六段，並獲得扶持、俸祿，開始出賽御城碁[參1]。
其他
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此局為1696年於御城碁遇上井上家跡目道節，策元持黑；道節為昔日道策門下第一弟子，由於與道的競爭跡目失敗而被過繼至井上家；兩人的對局被視作當時頗為緊張的場面。由於道節的佈局為弱項，至中盤才會以力量反擊；本局道節佈局時落後而被策元掌握主導權，至終盤策元都沒有給予道節反擊的機會，最後策元黑五目勝。圖中為第139手時的情勢（△一子為第139手），至此局勢已定[參1][參10]。
參考資料
外部連結
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