(;AB[rd]AB[qd]AB[pd]AB[od]AB[nd]AB[md]AB[mc]AB[mb]AB[ma]AW[nb]AW[nc]AW[pc]AW[rc]AW[qc]AW[ra]C[not too hard]AP[goproblems]
(;B[sb]
(;W[sc]C[CHOICE]
(;B[pb];W[ob]
(;B[oa];W[pa];B[qb];W[oc];B[rb]C[RIGHT])
(;B[pa];W[oc])
(;B[oc];W[qb])
(;B[na];W[pa]
(;B[oa];W[qb])
(;B[qb];W[oc];B[oa];W[rb])))
(;B[pa];W[pb]
(;B[rb];W[oa])
(;B[na];W[qa]))
(;B[ob];W[oc]
(;B[na];W[pb]
(;B[oa];W[rb])
(;B[pa];W[qa];B[oa];W[rb]))
(;B[pb];W[na]))
(;B[oc];W[ob]
(;B[pb];W[qb])
(;B[oa];W[pa]))
(;B[rb];W[qb]))
(;W[pb];B[sc];W[rb];B[na];W[oa];B[oc]C[RIGHT]))
(;B[ob];W[sb])
(;B[pa];W[sb])
(;B[oc];W[sb])
(;B[oa];W[sb])
(;B[na];W[sb]))