(;AB[ra]AB[rb]AB[rd]AB[rc]AB[qe]AB[pe]AB[pd]AB[pc]AB[od]AB[md]AB[nd]AB[mb]AW[lb]AW[lc]AW[ld]AW[nb]AW[oc]AW[pb]AW[qb]AW[qa]AW[qc]AW[qd]AW[re]AW[rf]AW[qf]C[Black to Capture White stones.]TR[pb]TR[qb]TR[qa]TR[qc]TR[qd]AW[jb]AP[goproblems]
(;B[oa]
(;W[ob]
(;B[mc];W[ma]
(;B[na];W[pa]
(;B[na]C[RIGHT])
(;B[la];W[na];B[ka];W[ja]))
(;B[nc];W[na]))
(;B[na];W[mc]
(;B[nc];W[ma])
(;B[ma];W[nc]))
(;B[ma];W[mc];B[nc];W[la])
(;B[nc];W[mc]))
(;W[na];B[nc]C[RIGHT]))
(;B[mc];W[ma]
(;B[oa];W[na]
(;B[nc];W[ob])
(;B[ob];W[pa];B[ob];W[oa]))
(;B[ob];W[oa])
(;B[nc];W[ob];B[na];W[oa]))
(;B[nc];W[ob]
(;B[mc];W[ma];B[na];W[oa])
(;B[na];W[mc]
(;B[oa];W[ma])
(;B[la];W[ka])
(;B[ma];W[la];B[oa];W[pa])))
(;B[na];W[mc]
(;B[nc];W[ob]
(;B[oa];W[ma])
(;B[la];W[ka])
(;B[ma];W[la];B[oa];W[pa]))
(;B[ob];W[oa];B[nc];W[ma];B[ob]C[It's a Ko.]))
(;B[ob];W[oa]
(;B[nc];W[ob]
(;B[ma];W[mc])
(;B[mc];W[ma]))
(;B[ma];W[mc];B[nc];W[ob])
(;B[mc];W[ma]))
(;B[ma];W[mc]
(;B[nc];W[ob])
(;B[ob];W[oa];B[nc];W[ob])
(;B[oa];W[ob];B[nc];W[la])))