(;AB[br]AB[bq]AB[bp]AB[co]AB[do]AB[eo]AB[fp]AB[gp]AB[gq]AW[cr]AW[cq]AW[cp]AW[dp]AW[ep]AW[fq]AW[fr]AW[gr]AW[hr]AW[iq]AB[eq]C[Black to capture some stones]AP[goproblems]
(;B[cs];W[dr]
(;B[ds];W[er])
(;B[er];W[es])
(;B[dq];W[er])
(;B[es];W[er]))
(;B[dr]
(;W[er];B[cs]C[RIGHT])
(;W[ds];B[es]
(;W[er];B[cs];W[dq];B[eq]C[RIGHT])
(;W[cs];B[bs]C[RIGHT])
(;W[bs]C[when responds in the most proper way, the best result is ko];B[cs]C[RIGHT])))
(;B[ds];W[dr];B[er];W[cs];B[es];W[fs])
(;B[dq];W[dr])
(;B[er];W[ds];B[es];W[fs];B[bs];W[dr]))