(;AB[rc]AB[qb]AB[pa]AB[ob]AB[pc]AB[oc]AB[od]AB[of]AB[oe]AB[re]AB[qe]AW[ra]AW[rb]AW[qc]AW[qd]AW[rd]AW[pd]AW[pe]AW[pf]AW[pg]AW[qg]AB[rh]AB[rg]AB[oh]AB[ri]AW[qh]AW[qi]AB[qj]AB[pj]AB[ph]AB[og]C[Black to Kill. (without Ko)]AP[goproblems]
(;B[sd];W[rf]
(;B[sg];W[sc]
(;B[se];W[qf];B[sf]C[RIGHT])
(;B[sf];W[se]C[It's a Ko.]))
(;B[sf];W[sc]
(;B[qf];W[se]C[It's a Ko.])
(;B[se];W[sg]
(;B[qf];W[rf])
(;B[sh];W[qf]
(;B[sg];W[rj])
(;B[rj];W[sg])
(;B[pi];W[sg]))))
(;B[sc];W[sf]
(;B[pi];W[qf];B[sb];W[se])
(;B[sb];W[se];B[pi];W[qf])
(;B[sg];W[qf];B[pi];W[se]))
(;B[se];W[sc]
(;B[sg]C[RIGHT];W[qf];B[sf]C[RIGHT])
(;B[sf];W[sg]
(;B[qf];W[rf])
(;B[sh];W[qf]
(;B[sg];W[rj])
(;B[rj];W[sg])
(;B[pi];W[sg]))))
(;B[sb];W[sc]C[It's a Ko.]))
(;B[sc];W[sd]
(;B[sb];W[rf]
(;B[sf];W[se])
(;B[qf];W[se]))
(;B[se];W[sb]))
(;B[se];W[sd])
(;B[qf];W[se]
(;B[rf];W[sc])
(;B[sc];W[rf]))
(;B[sf];W[sd])
(;B[rf];W[sd])
(;B[qa];W[sc]))