(;AB[oq]AB[pq]AB[qq]AB[rp]AW[ro]AW[qo]AW[qm]AW[pp]AW[op]AW[np]AW[nq]C[White first to kill!]AP[goproblems] (;W[rr];B[rq] (;W[or];B[ps] (;W[nr];B[sr]C[Black is alive!]) (;W[qs];B[qr];W[rs];B[sp];W[sr];B[sq]C[Not right!]) (;W[sp];B[sr];W[qs];B[rs]C[Ko to kill. White can kill unconditionally.])) (;W[nr];B[or];W[qr];B[sr];W[sp];B[rs];W[qs];B[ps]C[White can kill without ko!])) (;W[or];B[pr];W[rr] (;B[nr];W[mr];B[os];W[rq]C[Great! Black is dead!RIGHT]) (;B[rq];W[nr] (;B[sr];W[rs]C[Great! Black is dead!RIGHT]) (;B[rs];W[sr]C[Great! Black is dead!RIGHT]))))