(;AW[po]AW[pn]AW[qn]AW[rn]AW[ro]AW[op]AW[oq]AW[pr]AW[ps]AW[or]AW[pq]AB[os]AB[ns]AB[nq]AB[nr]AB[np]AB[oo]AB[on]AB[om]AB[pm]AB[qm]AB[rm]AB[sm]AB[sn]AB[qr]AB[so]AW[rp]AW[sp]C[What can black do in the corner?]AP[goproblems]
(;B[qq];W[sr]
(;B[qp];W[pp]
(;B[rr];W[qs]
(;B[rs]C[Seki is best.RIGHT])
(;B[rq];W[rs]))
(;B[rq];W[rs]
(;B[qs];W[sq])
(;B[sq];W[qs])
(;B[rr];W[sq]))
(;B[qs];W[rr]
(;B[rq];W[rs])
(;B[rs];W[rq]))
(;B[rs];W[rr]
(;B[rq];W[qs])
(;B[qs];W[rq]))
(;B[sq];W[rq]
(;B[rr];W[rs])
(;B[rs];W[rr])))
(;B[rq];W[sq]
(;B[qp];W[rs]
(;B[pp];W[qs])
(;B[qs];W[pp]))
(;B[qs];W[pp]
(;B[qp];W[rs])
(;B[rs];W[qp])))
(;B[qs];W[pp]
(;B[qp];W[rr]
(;B[rq];W[rs])
(;B[rs];W[rq]))
(;B[rq];W[sq];B[qp];W[rs])
(;B[rr];W[qp])
(;B[sq];W[rq])
(;B[rs];W[qp])
(;B[ss];W[qp]))
(;B[rs];W[qp])
(;B[rr];W[qp])
(;B[pp];W[qp]))
(;B[rq];W[qq])
(;B[qs];W[qq])
(;B[sr];W[qq])
(;B[rr];W[qq]
(;B[qp];W[sr])
(;B[sr];W[qp])
(;B[rq];W[qp])
(;B[qs];W[qp]))
(;B[qp];W[qq];B[rr];W[sr]))