(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
PW[White]PB[Black]AW[ca][ga][gb][ac][bc][cc][dc][ec][fc][gc]AB[ab][bb][cb][db][eb][fb]LB[ba:A][fa:B]
(;B[ba]
(;W[fa]C[not a threat]
;B[]
;W[ea]
;B[da])
(;W[da]C[not a threat]
;B[]
;W[fa]
;B[ea])
(;W[ea]
;B[]
;W[fa]
;B[da]))
(;B[fa]
;W[da]C[kou threat]
(;B[]
;W[ba]C[seki])
(;B[ba])))
