(;C[Black to win]AW[qs]AW[ps]AB[pr]AB[pq]AB[pp]AB[po]AB[oo]AW[os]AW[or]AW[oq]AW[op]AB[nr]AB[nq]AB[np]AB[mr]AW[lr]AW[lq]AW[mq]AW[no]AW[mo]AP[goproblems]
(;B[rs]
(;W[rr];B[qr];W[ss];B[ns];W[rs];B[rq]C[RIGHT])
(;W[qr]C[CHOICE];B[rr];W[qq]
(;B[rq];W[qp]
(;B[qo];W[rp]
(;B[ro];W[sp]
(;B[so];W[sq]
(;B[ns]C[RIGHT])
(;B[sr];W[ss]))
(;B[sq];W[sr])
(;B[ns];W[mp]))
(;B[sp]
(;W[sq]
(;B[ro];W[so];B[ns]C[RIGHT])
(;B[sr];W[so]
(;B[ro];W[sq]C[Ko])
(;B[ns];W[sq]C[Ko])))
(;W[ro]C[This old defense variation was not as challenging.];B[rn];W[so]
(;B[sn];W[sq];B[ns]C[RIGHT])
(;B[ns];W[sq];B[sn]C[RIGHT])))
(;B[ns];W[mp]))
(;B[ns];W[mp])
(;B[rp];W[qo];B[qn];W[pn]
(;B[on];W[rn]
(;B[qm];W[ro])
(;B[pm];W[ro])
(;B[ro];W[qm]))
(;B[ro];W[on])
(;B[ns];W[on])))
(;B[qp];W[rq];B[rp];W[sq];B[sp];W[ms];B[sr];W[ss])
(;B[ns];W[mp])))
(;B[ns];W[mp])
(;B[rr];W[ns];B[ms];W[ls])
(;B[qr];W[rs];B[rr];W[ms]))