(;AP[goproblems]AB[qc]AB[nb]AW[ob]AW[na]AW[pb]AB[pc]AB[od]AB[rd]AW[qa]AB[oc]AW[rb]AB[ma]AW[jc]TR[ma]TR[nb](;W[qb];B[oa](;W[sc];B[sd](;W[rc];B[sa])(;W[sa];B[rc]))(;W[rc];B[sd](;W[sc];B[sa])(;W[sa];B[sc])(;W[sb]C[Only one eye.]))(;W[sb];B[sc];W[rc];B[sd])(;W[sd];B[sc](;W[rc];B[se](;W[sb];B[sd])(;W[sa];B[sd]))(;W[sb];B[rc])))(;W[oa];B[qb])(;W[mb](;B[nc]C[White gets lucky...](;W[la]C[RIGHT])(;W[oa];B[qb]C[];W[la];B[mc];W[lc]TR[oa]C[This variation also works, but it is not as good as simply capturing.RIGHT])(;W[lb];B[oa]))(;B[oa]C[CHOICE](;W[nc];B[mc];W[na]C[Black can force this ko.RIGHT])(;W[la];B[mc])(;W[pa];B[mc])))(;W[rc];B[oa])(;W[pa];B[mb])(;W[nc];B[mb]))