(;GM[1]FF[4]SZ[19]AP[SmartGo:0.8.8]CA[gb2312]GN[182exRMH]AB[qp][rp][pq]AW[qo][ro][op][pp][nq][mr]C[Black to play and live]
(;B[rr]C[This is incorrect];W[qq]
(;B[qr];W[pr];B[rq];W[or])
(;B[pr];W[rq];B[qr];W[sp])
(;B[or];W[qr])
(;B[rq];W[pr]))
(;B[qq]C[This also does not work.]
(;W[rr])
(;W[or];B[rr];W[sq]))(;B[qr]C[This is the correct play.]
(;W[rq]C[This is White's strongest attack.]
(;B[qq]C[This is the correct response.]
(;W[rr];B[sr];W[rs];B[or];W[sp];B[sq];W[ss];B[sq];W[sr]
;B[qs]C[Black is alive])
(;W[sp]
;B[sr]C[It is important for Black to play here to avoid ko.];W[sq];B[rr];W[so]
;B[or]C[Black is alive.]))
(;B[sq]C[This does not work.];W[sr];B[sp];W[rr];B[rs];W[so];B[qq]
;W[or]C[Black can only make one eye.]))
(;W[or]C[This is a difficult move to handle, but Black can still live.];B[sr];W[rs];B[pr];W[rq];B[rr];W[sp];B[qq])
(;W[sr]C[This also does not work for White.];B[rq]))
)
