(;AB[os]AB[or]AB[oq]AB[op]AB[pp]AB[qp]AB[qo]AB[ro]AB[so]AW[rp]AW[sp]AW[qq]AW[pq]AW[pr]AW[rr]C[kill white with KO]AP[goproblems]
(;B[ps]
(;W[qs]
(;B[sr]
(;W[rq];B[rs];W[ss]C[koRIGHT])
(;W[ss];B[rs]C[RIGHT])
(;W[rs];B[rq]C[RIGHT]))
(;B[rq];W[sq]))
(;W[rs];B[qs]
(;W[qr];B[sr]C[RIGHT])
(;W[sr];B[rq]C[RIGHT]))
(;W[sr];B[qs];W[rs];B[rq]C[RIGHT]))
(;B[sr]
(;W[rq]
(;B[ps];W[qs];B[rs];W[ss]C[koRIGHT])
(;B[qs];W[ps];B[rs]C[seki])
(;B[rs];W[ps];B[qs]))
(;W[qs];B[rq]C[RIGHT])
(;W[rs];B[rq]C[RIGHT]))
(;B[qs];W[ps]
(;B[sr];W[rq];B[rs]C[seki])
(;B[rs];W[sr]))
(;B[rs];W[ps]
(;B[sr];W[rq];B[qs])
(;B[qs];W[sr])
(;B[rq];W[sq];B[sr];W[ss]C[bad ko - black needs to win it, play r1 and win again to kill]))
(;B[rq];W[sq]
(;B[ps];W[qs])
(;B[qs];W[ps])
(;B[rs];W[qs])))