I watched a fast game between Mr Saijo and a amatuer player. Mr Saijo sprung this trap on our poor friend and he failed the test. Mr Saijo then had a great deal of fun asking everyone around the table how to solve it. So easy when you know the answer, so hard when you're playing the game! :)
(;AW[rr][qr][rq][os][or][oq][op][pp][qo][ro][qn][qm][pl]AB[ps][pr][pq][qq][qp][rp][so][rn][rm][ql][qk]C[Black to Live and kill White]SZ[19]
(;B[sp]
(;W[qs]
(;B[rs];W[ss];B[sq]C[RIGHT])
(;B[sq];W[sr];B[sn];W[rl])
(;B[sr];W[ss]C[Ko, you can do better])
(;B[sn];W[sq];B[rl];W[ss]))
(;W[sq]C[CHOICE]
(;B[sr];W[ss];B[qs]C[RIGHT])
(;B[qs];W[rs];B[sn];W[rl])
(;B[rs];W[ss]C[Ko, you can do better])
(;B[sn];W[qs];B[rl];W[ss])))
(;B[sq];W[qs];B[sp];W[sr];B[sn];W[rl])
(;B[qs];W[rs];B[sp];W[sq];B[sn];W[rl])
(;B[sr];W[qs];B[sp];W[ss]C[Ko, You can do better])
(;B[rs];W[sq];B[qs];W[ss]C[Ko, you can do better.])
(;B[ss];W[qs];B[sp];W[sq];B[sn];W[rl]))