(;AW[rr]AW[qr]AB[rq]AB[qq]AB[nr]AB[or]AB[pr]AW[ms]AW[mr]AW[nq]AW[pp]AW[qp]AW[ro]AW[rn]AB[rp]C[W to move]AB[pq]AW[mq]AW[op]AW[sn]AP[goproblems]
(;W[sr]
(;B[qs]
(;W[sp];B[sq];W[ns];B[os];W[oq];B[so]C[nice, a ko! :)RIGHT])
(;W[ns];B[os]
(;W[sp];B[sq];W[oq];B[so]C[nice, a ko! :)RIGHT])
(;W[rs];B[sq];W[ps]C[Only an approach ko]))
(;W[os];B[ns])
(;W[sq];B[sp])
(;W[rs];B[sq]
(;W[ps];B[os]C[extra approach move! :(])
(;W[ns];B[ss]MA[rr]MA[os]))
(;W[ps];B[rs]C[(no ko, living shape)]))
(;B[ns]C[see next problem!])
(;B[sp]C[see next problem!]))
(;W[ps];B[rs]
(;W[sr];B[qs]C[(no ko, living shape)])
(;W[qs];B[sr]C[(no ko, living shape)])
(;W[sp];B[sr])
(;W[ns];B[sr]))
(;W[rs];B[ns]MA[ps]MA[sr]C[seki at least])
(;W[qs];B[sr]
(;W[rs];B[sp])
(;W[sp];B[ps])
(;W[ns];B[sp]))
(;W[sp];B[sr]
(;W[rs];B[ns]MA[ps]C[seki])
(;W[qs];B[ps]MA[ns]MA[rs])
(;W[ns];B[rs]))
(;W[ns];B[sr]
(;W[rs];B[sp];W[ps];B[os]C[extra approach move])
(;W[sp];B[rs])
(;W[qs];B[sp]))
(;W[sq];B[sp])
(;W[os];B[ns]))