(;AP[goproblems]AB[qs]AB[qr]AB[pq]AB[pp]AB[qp]AB[rp]AB[sp]AW[pr]AW[ps]AW[or]AW[oq]AW[op]AW[oo]AW[po]AW[qo]AW[ro]AW[so](;W[qq];B[rq]C[what was that?])(;W[ss];B[rr](;W[sr])(;W[rs];B[sr]C[no comment...])(;W[sq];B[sr];W[rq];B[qq]))(;W[rs];B[rr](;W[ss];B[sr]C[no comment...])(;W[sr];B[ss];W[sq];B[rq]))(;W[sr];B[rq](;W[rr];B[rs]C[Seki.])(;W[rs];B[rr])(;W[sq];B[rr]))(;W[sq];B[rq](;W[sr];B[rr])(;W[rr];B[sr](;W[rs];B[ss])(;W[ss];B[rs]))(;W[rs];B[sr](;W[rr];B[ss])(;W[ss];B[rr]))(;W[ss];B[sr](;W[rr];B[rs])(;W[rs];B[rr])))(;W[rq](;B[rr](;W[qq])(;W[sq];B[qq](;W[sr];B[ss])(;W[ss];B[sr]))(;W[sr];B[qq](;W[rs];B[ss]C[Ko, Black takes first. Almost right.])(;W[sq];B[ss]))(;W[ss];B[sr](;W[sq];B[qq])(;W[qq];B[sq](;W[qq];B[rq])(;W[rq];B[qq]))))(;B[sr](;W[sq];B[qq])(;W[rr];B[rs](;W[qq];B[sq](;W[qq];B[rq])(;W[rr];B[rq])(;W[rq];B[qq]))(;W[sq];B[qq]))(;W[qq];B[sq])(;W[rs];B[rr])(;W[ss];B[rr](;W[sq])(;W[qq];B[sq](;W[qq];B[rq])(;W[rq];B[qq])))))(;W[rr];B[rs](;W[sr];B[rq]C[Sente seki is not enough.])(;W[rq];B[sr](;W[qq];B[sq](;W[qq];B[rq])(;W[rr];B[rq])(;W[rq];B[qq]))(;W[sq];B[qq]))(;W[ss];B[sr](;W[qq];B[rq])(;W[rq];B[sq])(;W[sq];B[rq]))(;W[sq];B[sr]LB[ss:Ko?]C[](;W[rq];B[qq])(;W[qq];B[rq])(;W[ss]C[Ko, White takes first; the best you can get here.RIGHT]))(;W[qq];B[rq](;W[sq])(;W[sr]C[seki])(;W[ss]))))