(;AB[qd]AW[od]AB[mc]AW[qc]AB[rc]AB[re]AW[rb]AB[sd]AW[pc]AB[sb]AW[nc]AB[md]AW[nb]AB[mb]AB[ne]AB[of]AB[pf]C[Black to kill.]AB[kb]AW[ra]AP[goproblems]
(;B[ob]
(;W[pa]
(;B[na]
(;W[oa]
(;B[pb]
(;W[qb]
(;B[qa]
(;W[oa]
(;B[pa]
(;W[oc]
(;B[oa];W[ma]
(;B[pa]C[]
(;W[oa];B[pb]C[RIGHT])
(;W[pb];B[oa]C[RIGHT]))
(;B[oa];W[pa]))
(;B[ma];W[oa];B[pa];W[pb];B[ob]C[ko]))
(;W[ma];B[oa];W[oc];B[pa];W[oa];B[pb]C[RIGHT]))
(;B[ma];W[oc];B[pa];W[oa];B[pa];W[pb];B[ob]C[ko]))
(;W[pa];B[oa]C[RIGHT])
(;W[oc];B[oa]C[RIGHT])
(;W[ma];B[oa]C[RIGHT]))
(;B[ma];W[oc]))
(;W[oc];B[qb]C[RIGHT])
(;W[ma];B[qb]C[RIGHT]))
(;B[ma];W[pb]))
(;W[pb];B[oa]C[RIGHT])
(;W[oc];B[oa]C[RIGHT])
(;W[qb];B[oa]C[RIGHT]))
(;B[pb];W[qb]
(;B[oa];W[na];B[qa];W[oc])
(;B[na];W[oc]
(;B[ma];W[oa])
(;B[oa];W[ma])))
(;B[oa];W[na];B[pb];W[qb];B[qa];W[oc])
(;B[ma];W[na]))
(;W[pb];B[na]C[RIGHT])
(;W[oc];B[na]C[RIGHT])
(;W[na];B[pb]C[RIGHT])
(;W[oa];B[pa];W[na];B[pb]C[RIGHT])
(;W[qb];B[na]C[RIGHT]))
(;B[na];W[ob])
(;B[oa];W[ob])
(;B[pa];W[ob])
(;B[pd];W[pb])
(;B[nd];W[pb])
(;B[pb];W[ob]))