(;AW[ra]AW[qb]AW[pc]AW[oc]AB[rb]AB[sb]AB[qc]AB[qd]AW[od]AW[nd]AW[nb]AW[mb]AW[mc]AB[lc]AB[lb]AB[ld]AB[ma]AB[jb]AB[ne]AB[oe]AB[pe]AB[md]C[Black to move]AP[goproblems]
(;B[oa]
(;W[na]
(;B[pb];W[qa]
(;B[sa]C[Well done! :)RIGHT])
(;B[pd];W[rc]
(;B[rd];W[la];B[ka];W[ob]C[:(])
(;B[la];W[sc]C[:(];B[rd];W[sa]
(;B[rb]C[Seki. But isn't enough as killing the group was possible.])
(;B[sb]C[NOTTHIS])
(;B[sd];W[pa]C[:(]))
(;B[sc]C[NOTTHIS]))
(;B[la];W[ob]C[:(]))
(;B[la];W[pb]C[:(])
(;B[pd];W[pb]C[:(])
(;B[pa];W[pb]C[:(]))
(;W[ob];B[na];W[pa];B[la]C[RIGHT])
(;W[pa];B[na];W[ob];B[la]C[RIGHT]))
(;B[na];W[oa]
(;B[pb];W[pa];B[qa]MA[qb]C[:(])
(;B[la];W[pb]C[:(])
(;B[pa];W[la]C[:(]))
(;B[ob];W[oa]C[:(])
(;B[pb];W[pa];B[qa]MA[qb]C[Ko. But it's not good enough as kill was possible!])
(;B[pa];W[oa]
(;B[pb];W[ob]C[:(])
(;B[qa];W[pb]C[:(]))
(;B[pd];W[pb]C[:(]))