(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
AW[bo][cp][dp][ep][fp][bq][fq][br][dr][fr][as]AB[an][bn][co][do][eo][fo][go][gp][dq][eq][gq][er][gr][fs]C[Black's move, your task is to kill the group of whites in the corner]
(;B[cs]
;W[cr]
(;B[ds]
;W[cq]
(;B[es]
;W[bs]
(;B[gs]
;W[ao]
(;B[ap]
;W[aq]
;B[bp]C[Correct! RIGHT])
(;B[bp]
;W[ap])
(;B[aq]
;W[ap]
;B[bp]C[Correct! RIGHT]))
(;B[ao]
;W[gs])
(;B[ap]
;W[gs])
(;B[aq]
;W[gs]))
(;B[ap]
;W[es]
(;B[ao]
;W[gs])
(;B[aq]
;W[gs])
(;B[er]
;W[eq]
;B[aq]
;W[bs]
(;B[es]
;W[gs])
(;B[gs]
;W[es])))
(;B[ao]
;W[es]
(;B[aq]
;W[gs])
(;B[bp]
;W[gs])
(;B[er]
;W[eq]
(;B[es]
;W[aq])
(;B[aq]
;W[bs]
(;B[gs]
;W[es])
(;B[es]
;W[gs])))))
(;B[ap]
;W[ds]
(;B[es]
;W[aq])
(;B[aq]
;W[es]))
(;B[es]
;W[ds]
(;B[ap]
;W[aq])
(;B[ao]
;W[aq])
(;B[aq]
;W[ap]
;B[ao]
;W[bp])))
(;B[ao]
;W[cq]
(;B[es]
;W[ds]
(;B[gs]
;W[aq])
(;B[cs]
;W[gs]))
(;B[ds]
;W[es])
(;B[cs]
;W[es]))
(;B[ds]
;W[cs]
(;B[es]
;W[cq]
(;B[cr]C[It is only ko])
(;B[ap]
;W[gs])
(;B[gs]
;W[cr]
(;B[ap]
;W[aq])
(;B[ao]
;W[aq]))
(;B[ao]
;W[gs]))
(;B[cr]
;W[cq]
(;B[es]
;W[dr]C[It is only ko])
(;B[dr]
;W[es])
(;B[gs]
;W[dr]C[It is only ko])
(;B[bs]C[It is only ko])))
(;B[cr]
;W[cq]
(;B[cs]
;W[es])
(;B[es]
;W[cs])
(;B[ds]
;W[cs]
(;B[es]
;W[dr]C[It is only ko])
(;B[bs]C[It is only ko])
(;B[dr]
;W[es])
(;B[gs]
;W[dr]C[It is only ko])))
(;B[cq]
;W[cr]
(;B[bp]
;W[aq])
(;B[es]
;W[bp]
;B[ds]
;W[cs])))