(;AP[goproblems]AB[sr]AB[rq]AB[qq]AB[qp]AB[pq]AB[or]AW[nr]AW[oq]AW[np]AW[pp]AW[po]AW[qo]AW[ro]AW[rp]AB[ps]AW[qs]AW[mr]C[White to kill.](;W[rs];B[qr](;W[ns];B[ss]TR[os]C[Black is dead! She can't play the marked stone to make live.RIGHT])(;W[rr];B[ss]C[Black is alive!])(;W[ss];B[rr]C[Black is alive!])(;W[sp];B[rr](;W[ns];B[ss](;W[os]C[RIGHT])(;W[sq];B[os])(;W[qs]C[RIGHT]))(;W[sq];B[ss])(;W[os];B[ns])))(;W[qr];B[rs];W[ns];B[rr];W[os];B[pr]C[Black is alive!])(;W[rr];B[qr](;W[ns];B[rs]C[Black is alive!])(;W[rs];B[ss]C[Black is alive!]))(;W[ns];B[rs](;W[os];B[qr]C[Black is alive!])(;W[qr];B[rr];W[os];B[pr]C[Black is alive!]))(;W[sp];B[rs]))