(;AW[sq]AW[rq]AW[qq]AW[oq]AW[or]AB[nr]AB[nq]AB[op]AB[pp]AB[qp]AB[rp]AB[sp]AB[mr]AB[sr]AW[pq]C[B to move]AP[goproblems]
(;B[ps];W[os]
(;B[qr];W[rr];B[rs];W[ss];B[ns];W[qs]C[right, ko!RIGHT])
(;B[rs];W[qr];B[qs];W[rr];B[ns];W[ss]C[right, ko!RIGHT])
(;B[rr];W[qr];B[qs];W[rs])
(;B[qs];W[rs];B[rr];W[qr])
(;B[ns];W[qr]))
(;B[os];W[ps]C[]
(;B[qs];W[ns]
(;B[qr];W[rr];B[rs]C[White alive by double-ko. (To capture B would need to win both o1-p1 ko and t1-t2 ko)])
(;B[rr];W[qr])
(;B[rs];W[qr])
(;B[ms];W[rs]))
(;B[qr]
(;W[rr];B[rs];W[ns];B[qs])
(;W[rs]LB[rr:1]LB[ns:2]))
(;B[rs];W[qr]))
(;B[qs];W[ps]
(;B[os];W[ns]
(;B[qr];W[rr];B[rs]C[White alive by double-ko. (To capture B would need to win both o1-p1 ko and t1-t2 ko)])
(;B[rr];W[qr])
(;B[rs];W[qr])
(;B[ms];W[rs]))
(;B[qr];W[rr]
(;B[rs];W[ns]C[White alive by double-ko. (To capture B would need to win both o1-p1 ko and t1-t2 ko)])
(;B[ns];W[rs]))
(;B[rr];W[qr])
(;B[rs];W[qr])
(;B[ns];W[rs]))
(;B[rs];W[ps]MA[qr]MA[rr])
(;B[rr];W[qr])
(;B[qr];W[rr])
(;B[pr];W[qr])
(;B[ns];W[qr]))