(;AW[rs]AW[rr]AB[qr]AB[pr]AB[os]AW[or]AW[nr]AB[mr]AB[mq]AB[ms]AW[ls]AW[lr]AW[lq]AW[lp]AW[mp]AB[oq]AB[np]AB[pp]AB[po]AB[oo]AB[no]AW[pq]AW[qq]AW[qp]AW[qo]AW[pn]AW[on]AW[nn]AW[mn]C[Black to play and live. If you know the under-the-stones tesuji, you can live.]AP[goproblems]
(;B[ps];W[qs];B[nq];W[ns];B[pr]C[RIGHT])
(;B[nq];W[ps];B[ns];W[or];B[qs];W[ps])
(;B[ns];W[ps];B[nq];W[or];B[qs];W[ps]))