(;AB[sp]AB[ps]AW[pq]AW[pr]AW[qr]AW[rq]AW[rp]AB[ro]AB[rn]AW[qo]AW[po]AB[qn]AB[pn]AB[on]AB[op]AB[oq]AB[or]AB[mr]C[Black to kill]AP[goproblems]
(;B[rr]C[]
(;W[rs]C[CHOICE]
(;B[sr];W[sq];B[qp];W[ss];B[pp]C[RIGHT])
(;B[qp];W[sr]))
(;W[sr]C[CHOICE]
(;B[rs];W[qs];B[pp];W[ss];B[qp]C[RIGHT])
(;B[pp];W[rs])))
(;B[pp];W[qp]
(;B[rs];W[qs];B[rr];W[os];B[sq];W[sr]C[What a shame black didn't have a stone at p5...])
(;B[sr];W[sq];B[rs];W[qs];B[oo];W[so])
(;B[rr];W[rs];B[sr];W[sq])
(;B[oo];W[qs]))
(;B[qp];W[pp]
(;B[rr];W[sr];B[rs];W[qs]C[If only Black had a stone at p5 this could've been possible...])
(;B[sr];W[sq]
(;B[rr];W[so];B[qs];W[rs]C[Sorry...])
(;B[rs];W[qs];B[oo];W[so]C[Nothing]))
(;B[rs];W[qs];B[sr];W[sq];B[oo];W[so]C[Nothing]))
(;B[sq];W[sr];B[rs];W[qs])
(;B[rs];W[qs];B[pp];W[qp];B[rr];W[os];B[sq];W[sr])
(;B[sr];W[sq];B[qp];W[pp]
(;B[rr];W[so];B[qs];W[rs]C[Sorry...])
(;B[rs];W[qs]))
(;B[oo];W[pp]))