(;AB[rc]AB[rd]AB[qc]AB[pc]AB[oc]AB[nc]AW[sd]AW[re]AW[qd]AW[pd]AW[od]AW[of]AW[pf]AW[ph]AW[qi]AW[ri]AB[sg]AB[rg]AB[qg]C[black to connect his stones.]AP[goproblems]
(;B[qe];W[qf]
(;B[se];W[sf]
(;B[rf];W[pe]
(;B[sc]C[RIGHT])
(;B[se]C[ko only.]))
(;B[sc];W[rf]))
(;B[rf];W[se]
(;B[sf];W[pe];B[sc];W[qe])
(;B[sc];W[pe];B[sf];W[qe]))
(;B[sc];W[se];B[sf];W[pe])
(;B[sf];W[se]
(;B[sc];W[pe])
(;B[rf];W[pe];B[sc];W[qe])))
(;B[se];W[sf]
(;B[qe];W[qf]
(;B[rf];W[pe]
(;B[sc]C[RIGHT])
(;B[se]C[ko only.]))
(;B[sc];W[rf]))
(;B[rf];W[qe];B[se]C[ko only.])
(;B[sc];W[rf]
(;B[qe];W[qf])
(;B[qf];W[qe]))
(;B[qf];W[qe];B[rf];W[se]))
(;B[rf];W[se]
(;B[qe];W[qf]
(;B[sf];W[pe])
(;B[sc];W[pe];B[sf];W[qe]))
(;B[sc];W[qe])
(;B[sf];W[qe])
(;B[qf];W[qe]))
(;B[sf];W[se]
(;B[qe];W[qf]
(;B[sc];W[pe])
(;B[rf];W[pe];B[sc];W[qe]))
(;B[sc];W[qe])
(;B[rf];W[qe])
(;B[qf];W[qe]))
(;B[sc];W[se];B[qe];W[qf];B[rf];W[pe];B[sf];W[qe])
(;B[qf];W[qe]
(;B[se];W[sf]
(;B[rf];W[se])
(;B[sc];W[se]))
(;B[sc];W[se])
(;B[sf];W[se])))