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flag problem... (2) Well Constructed (2) Needs Fixing Invalid Duplicate
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Problem 14732
Created 2011-04-17
Source http://www.youtube.com/watch?v=CJ9Oexs59CE
Rating
Difficulty 8 dan
Average Solve Time 71 secs
User Attempts
31 / 243
Solve Ratio Rating 2 dan
rating history
This problem is taken from a blitz game between Takemiya Masaki and Cho Chikun. It was a very close game until this point. Takemiya is took black. Find his sequence.
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[fl][fm][cn][dn][do][dp][cq][eq][fq][fr][fs]AB[gm][fn][co][cp][fp][gp][gq][dr][gr][gs]C[Black to play.]
(;B[dq]
;W[cr]
(;B[br]
(;W[ds]
;B[bq]
;W[er]
(;B[bo]
(;W[bn]C[CHOICE]
;B[ap]
;W[an]
;B[ao]
;W[bs]
;B[ar]C[RIGHT])
(;W[ap]C[CHOICE]
;B[bs]
(;W[bn]C[CHOICE]
;B[ao]C[RIGHT])
(;W[ao]C[CHOICE]
;B[bn]C[RIGHT])))
(;B[bn]
;W[bm]
;B[bo]
;W[ap]
(;B[bs]
;W[an]
;B[bp]
;W[ao])
(;B[bp]
;W[bs])))
(;W[bq]
;B[cs]
(;W[bo]
;B[ep]C[RIGHT])
(;W[ep]
(;B[bp]C[RIGHT])
(;B[aq]C[RIGHT]))))
(;B[es]
;W[ep]
(;B[cs]
;W[er])
(;B[bq]
;W[br]
;B[bp]
;W[er])))
(;B[bq]
;W[dq]
(;B[cr]
;W[ar]
(;B[bo]
;W[bn]
;B[ap]
;W[an]
;B[ao]
;W[aq])
(;B[bn]
;W[bm]
;B[bo]
;W[an]
(;B[ao]
(;W[aq]
(;B[am]
;W[al]
;B[bl]C[Ko. (Black can do better.)])
(;B[br]
;W[bp]
(;B[am]
;W[al]
;B[bl]C[Ko. (Black can do better.)])
(;B[ap]
;W[bp])))
(;W[am]
(;B[aq]
(;W[br]
(;B[ap]
;W[bp])
(;B[bs]
(;W[bp]
;B[as]
;W[ap]
(;B[ar]
;W[ds])
(;B[br]
;W[ds])
(;B[ds])
(;B[er])
(;B[es]
;W[ds]
;B[cs]
;W[er]))
(;W[ds]
;B[as]
;W[bp]
;B[ap]
;W[br]
(;B[ar]
;W[cs]
;B[es]
;W[cs]
;B[er])
(;B[cs]
;W[er]
;B[ar]))
(;W[cs]
;B[as]
;W[ds]
;B[es]
;W[ds])))
(;W[ap]
;B[bp]
;W[br])
(;W[bs]
;B[br]
;W[bp]
;B[cs])
(;W[as]
;B[br]
;W[bp]
;B[ap]
;W[bs])
(;W[cs]
;B[br]
;W[bs]))
(;B[ap]
;W[aq])))
(;B[bp]
;W[ao]
;B[ap]
;W[am]
;B[br]
;W[bs]
;B[er]
;W[es]
;B[cs]
;W[as])
(;B[ap]
;W[am]
;B[ao]
;W[aq]))
(;B[br]
;W[bn]
(;B[bs]
;W[ds]
;B[es]
;W[er])
(;B[bo]
;W[ao]
;B[bp]
;W[ap]
;B[aq]
;W[as]
(;B[bs]
;W[ds]
;B[es]
;W[er])
(;B[ds]
;W[bs]))))
(;B[br]
;W[bn]
;B[ap]
;W[bo]
;B[bp]
;W[cr])))
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