(;GM[1]FF[4]SZ[19]CA[utf-8]AP[SmartGo One:1.6.7]GN[205bx]AB[op][pp][qp][mq][oq]AW[pq][qq][rr]C[Black to play.];B[rp]C[This is the correct first play.];W[or];B[nr]
(;W[ps]
(;B[sr]C[However this is incorrect.];W[qr];B[rs];W[sq];B[rq]
;W[ss]C[White gets a ko.])
(;B[ns]C[This is the correct play.]
(;W[rq];B[sq];W[sr];B[rs];W[qs]
;B[pr]C[White is dead.])
(;W[qs];B[rq];W[sr]
;B[pr]C[White is dead.])))
(;W[qs]C[This also fails for White.];B[pr];W[os];B[rq];W[qr]
;B[sr]C[White is dead.])
(;W[pr]C[This fails too.];B[qs];W[rs]
;B[sr]C[White is dead.]))
