(;AB[ra]AB[qb]AB[pb]AB[ob]AB[nc]AB[mc]AB[lb]AB[ma]AW[oc]AW[pc]AW[qc]AW[rb]AW[rc]AW[md]AW[nd]AW[lc]AW[kb]AW[ld]AW[kc]AW[ib]AP[goproblems]
(;W[nb];B[mb]
(;W[qa];B[na];W[pa];B[oa];W[qa]C[RIGHT])
(;W[na]
(;B[qa]C[CHOICE]
(;W[oa];B[pa];W[na]C[RIGHT])
(;W[la]C[RIGHT]))
(;B[oa]C[CHOICE];W[qa]C[RIGHT]))
(;W[oa];B[na]))
(;W[mb];B[nb];W[qa];B[pa])
(;W[na];B[nb];W[ka];B[oa]
(;W[qa];B[la])
(;W[la];B[qa]C[Just ko.];W[mb]))
(;W[qa];B[nb];W[pa];B[oa])
(;W[ka]
(;B[na]C[CHOICE];W[mb];B[nb];W[la]C[RIGHT])
(;B[oa]C[]
(;W[qa];B[nb];W[la]C[RIGHT])
(;W[la];B[mb];W[qa]C[RIGHT])
(;W[nb]C[RIGHT])
(;W[mb];B[nb]
(;W[qa];B[la])
(;W[la];B[qa];W[mb]))
(;W[na];B[qa];W[la];B[nb];W[mb])
(;W[pa];B[qa];W[mb];B[nb];W[la];B[mb]))
(;B[nb]C[CHOICE]
(;W[qa];B[la];W[pa];B[oa])
(;W[la];B[oa]
(;W[qa]C[RIGHT])
(;W[mb]C[R19 and M18 are miai. The ko does not need to be fought.RIGHT])))
(;B[qa]C[]
(;W[la];B[mb]
(;W[oa]C[RIGHT])
(;W[na];B[nb];W[oa]C[RIGHT]))
(;W[oa]C[RIGHT])
(;W[mb];B[nb];W[la];B[oa];W[mb])))
(;W[oa];B[nb])
(;W[pa];B[nb])
(;W[la]C[];B[ka]
(;W[na];B[nb]
(;W[ja];B[oa]
(;W[la];B[qa]C[Ko])
(;W[qa];B[la]))
(;W[qa];B[oa]))
(;W[nb];B[mb]
(;W[na];B[oa];W[qa]C[RIGHT])
(;W[qa];B[na];W[pa]C[RIGHT])
(;W[oa];B[na]))
(;W[qa];B[nb])
(;W[ja];B[na])
(;W[mb];B[nb])))