The 66th Honinbo began league play on 7 October 2010 and completed on July 21, 2011. Title holder Yamashita Keigo retained his title over challenger Hane Naoki by a score of 4-3. Yamashita Keigo won the first three games, Hane Naoki the next three, and Yamashita Keigo the final game.
Preliminary tournament The preliminary tournament started on 8 April 2010. Hane Naoki, Iyama Yuta, Takao Shinji, and Cho U retained their place in the Honinbo league from the 65th Honinbo. These players were joined by the winners of the preliminary tournament: Cho Sonjin, Seto Taiki, O Rissei, and Kobayashi Satoru.
League play League play commenced on 7 October after the preliminaries, which finished on 2 September. Hane Naoki, who lost the Honinbo title to Yamashita Keigo the year prior, won the right to challenge Keigo for the title.
PlayerH.N.I.Y.T.S.C.U.O.R.K.S.C.S.S.T.RecordNotesHane Naoki – B+R W+R X W+0.5 B+R W+R B+R 6–1 ChallengerIyama Yuta X – B+R X X W+R B+R W+R 4–3 Takao Shinji X X – B+1.5 X X W+R X 2–5 EliminatedCho U W+R B+0.5 X – B+3.5 X B+R X 4–3 O Rissei X W+R B+R X – X X B+R 3–4 EliminatedKobayashi Satoru X X W+2.5 B+4.5 W+R – X X 3–4 EliminatedCho Sonjin X X X X B+R W+11.5 – X 2–5 EliminatedSeto Taiki X X W+R B+R X B+3.5 W+R – 4–3
Finals Yamashita Keigo(Honinbo) W+7.5 B+R W+1.5 W+4.5 4 Hane Naoki(Challenger) W+0.5 B+R W+7.5 3
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