(;AP[goproblems]AB[rc]AB[rd]AB[qd]AB[pd]AB[oc]AB[nc]AB[nb]AB[lb]AW[ob]AW[pc]AW[pa]AW[qc]AW[rb]AW[ra]AW[sc]C[Black to kill.](;B[qb](;W[pb]C[CHOICE](;B[sb]C[Correct, white can only make a false eye at T18RIGHT])(;B[sd];W[sb])(;B[na];W[sb]))(;W[sb]C[CHOICE](;B[pb]C[Ouch! White is dead.RIGHT])(;B[sd];W[pb])(;B[qa];W[pb])(;B[na];W[pb])))(;B[sb];W[qb]MA[qa]MA[pb]C[White lives with two eyes.];B[oa];W[na];B[ma];W[oa])(;B[pb];W[qb]MA[pb]MA[qa]C[White has two eyes and is alive.](;B[oa];W[na];B[ma];W[oa])(;B[na];W[oa]))(;B[qa];W[qb](;B[oa];W[na];B[ma];W[oa])(;B[na];W[oa]))(;B[na];W[sb](;B[oa];W[pb])(;B[qb];W[pb])(;B[pb];W[qb];B[oa];W[pb])))