(;AW[sb]AW[rb]AW[rc]AW[rd]AW[qd]AW[pc]AW[oc]AW[nb]AW[nc]AB[qc]AB[qe]AB[re]AB[se]AB[sc]AB[sd]AB[pd]AB[od]AB[nd]AB[md]AB[mc]AB[ma]AB[mb]C[Use a tesuji to reduce w's territory as much as possible]AP[goproblems]
(;B[pa]
(;W[pb]
(;B[na];W[qa];B[oa]C[RIGHT])
(;B[qa];W[ra];B[na]C[RIGHT]))
(;W[na];B[qb];W[pb];B[qa]C[RIGHT]))
(;B[na];W[pa]
(;B[oa];W[pb])
(;B[ob];W[pb];B[oa])
(;B[pb];W[qb];B[oa];W[ob]))
(;B[pb];W[qb]
(;B[na];W[oa];B[pa];W[qa])
(;B[oa];W[na];B[qa];W[ra]))
(;B[ob];W[oa])
(;B[oa];W[pb]
(;B[na];W[pa])
(;B[pa];W[na];B[qa];W[ra])))